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1. Entry of iron into the body (diet and absorption):
Dietary iron is ingested in two forms:

• Heme iron: it comes mainly from animal foods and is absorbed more efficiently than non-heme iron. The mechanisms by which heme enters the enterocyte are not fully defined; HCP1/SLC46A1 is primarily a proton-coupled folate transporter and should not be presented as a proven specific heme transporter.
• Non-heme iron: derived from plant foods, dairy products, and eggs, it is present predominantly as ferric ions (Fe³⁺), which are less readily absorbed. It must be reduced to Fe²⁺ by reductase enzymes (Dcytb) on the enterocyte surface and then transported into the cell by DMT1. Absorption is modulated by dietary factors: vitamin C, citric acid, and amino acids enhance it; phytates, tannins, calcium, and polyphenols inhibit it.

Iron absorption occurs almost exclusively in the duodenum and proximal jejunum. Under physiologic conditions, only a fraction of ingested iron is absorbed, varying according to dietary composition and iron status, with a very tightly regulated daily balance between intake and loss.

2. Transport, storage, and utilization:
After absorption, iron enters the enterocyte cytoplasm, where it may follow three pathways:

• Be used for the enterocyte's local metabolic needs
• Be temporarily stored as ferritin (a storage form that can be mobilized according to demand and hepcidin regulation)
• Be exported to plasma through ferroportin (the only known cellular iron exporter), located on the basolateral membrane of enterocytes. This export is regulated systemically by the hormone hepcidin, produced by the liver

Iron exported by ferroportin is oxidized predominantly by hephaestin in the enterocyte and by other ferroxidases, including ceruloplasmin in other compartments, and then binds to transferrin for transport in plasma.

3. Fate and utilization of iron:

• Erythropoiesis: Approximately 65–70% of body iron is contained in the hemoglobin of circulating erythrocytes; iron is incorporated into heme during bone marrow erythropoiesis. Here, iron is inserted into protoporphyrin IX to form heme, a key constituent of hemoglobin's four globin subunits and responsible for the reversible transport and exchange of oxygen.
• Other functions: iron is also essential for myoglobin (muscle oxygen storage), numerous mitochondrial enzymes, catalase, cytochromes, and cellular redox systems.

Stored iron is contained mainly in ferritin, which is readily mobilizable, and in hemosiderin, which is less soluble and less readily mobilizable; the latter increases in iron overload but is not found exclusively in that condition.

The direct causes of iron deficiency anemia fall into four major categories, each capable, alone or in combination, of leading to iron deficiency:

• Reduced dietary iron intake: it occurs with diets low in bioavailable iron (vegetarian or vegan diets that are not adequately planned or provide insufficient iron intake/bioavailability, unbalanced diets in developing countries, eating disorders), as well as in infants fed only cow's milk or older adults with poor protein intake.
• Impaired intestinal absorption: this includes all conditions that prevent or reduce iron absorption in the duodenum and proximal small intestine, including:
  • Inflammatory diseases of the small intestine (celiac disease, Crohn disease, autoimmune enteropathies)
  • Surgical resection of the duodenum/jejunum, total or subtotal gastrectomy, gastric bypass surgery
  • Atrophic gastritis, achlorhydria, chronic use of proton pump inhibitors (reduced gastric acidity impairs reduction of non-heme iron)
  • Malabsorption due to documented intestinal or surgical conditions; severe pancreatic insufficiency and parasitic infections may contribute in selected settings, whereas liver and biliary diseases are not general direct causes
• Increased iron loss: chronic blood loss is the most common cause of iron deficiency anemia in adults and older people. Sources may be:
  • Gynecologic: menorrhagia, metrorrhagia, polyps, uterine fibroids
  • Gastrointestinal: ulcers, neoplasms, polyps, angiodysplasias, diverticular disease, hemorrhoids, hookworm infestation
  • Urinary and renal: chronic hematuria, neoplasms, hemorrhagic nephropathies
  • Other causes: repeated blood donation, chronic hemolysis with hemosiderinuria, recurrent epistaxis, extensive cutaneous losses (burns, chronic wounds)
• Increased iron requirements or losses: growth, adolescence, and pregnancy increase iron requirements; hemorrhage, blood donation, and procedures involving blood loss require replacement of lost iron. Lactation causes relatively modest iron losses, and the postoperative state without bleeding does not in itself represent a physiologic increase in iron requirements.

These causes may coexist and be additive, making diagnosis more complex, particularly in vulnerable populations such as children, pregnant women, and older people with multiple comorbidities.

Risk factors are clinical, physiologic, nutritional, environmental, and social conditions that, although not direct causes, increase the likelihood of iron deficiency, especially when they coexist or overlap with one of the causes listed above:

• Pediatric age: children have particularly high iron requirements because of rapid growth and often have diets that are quantitatively or qualitatively inadequate.
• Women of reproductive age: chronic menstrual blood loss, often underestimated, is the main predisposing factor in young and adult women.
• Pregnancy and lactation: pregnancy markedly increases total iron requirements. During lactation, iron loss in breast milk is modest and maternal requirements are generally lower than during pregnancy, partly because amenorrhea is common.
• Older age: multiple chronic conditions, use of medications that impair absorption (proton pump inhibitors, antacids), reduced meat intake, and a nutrient-poor diet are predisposing factors in older adults.
• Restrictive diets or unbalanced diets: inadequately planned vegetarian or vegan diets or diets with insufficient iron intake/bioavailability, severe weight-loss diets, eating disorders (anorexia, bulimia), psychiatric disorders.
• Adverse social and environmental conditions: poverty, lack of access to medical care, areas with a high incidence of parasitic infections, and food insecurity.
• Athletes and physically active individuals: intense physical activity, especially endurance exercise, may cause gastrointestinal microtrauma, impact hemolysis, profuse sweating, and increased erythrocyte turnover.

Chronic inflammatory or neoplastic conditions can cause a distinct form of anemia (anemia of chronic disease or inflammation), characterized by a functional reduction in iron availability due to iron sequestration and not necessarily by depletion of iron stores. In chronic kidney disease, anemia is instead multifactorial, with a central role for reduced erythropoietin production or response and possible concomitant inflammation-mediated iron restriction; these conditions are addressed separately.

Accurate identification of risk factors is crucial for primary prevention, early diagnosis, and monitoring for recurrence of iron deficiency anemia.

The clinical presentation of iron deficiency anemia reflects both the severity and duration of iron deficiency and the body's compensatory capacity, and is influenced by age, sex, comorbidities, and the rate at which the deficiency develops. In early stages or slowly progressive cases, many patients may remain asymptomatic or have subtle symptoms because adaptive mechanisms can mask the progressive reduction in tissue oxygen availability for a prolonged period.

Early and nonspecific symptoms
At presentation, clinical manifestations may be related both to iron deficiency and, when present, to anemia. The most common symptoms and signs include:

• Progressive fatigue, reduced exercise tolerance, easy fatigability, and daytime sleepiness, often overlooked or attributed to nonspecific causes.
• Progressive pallor of the skin and mucous membranes, initially most evident in the palpebral conjunctivae and oral mucosa.
• Palpitations, compensatory tachycardia, and mild exertional dyspnea, which tend to become more pronounced in moderate to severe forms.
• Headache, dizziness, irritability, tinnitus, and impaired concentration, resulting from reduced cerebral oxygenation and impairment of neuronal metabolic processes.
• Muscle cramps, reduced physical performance, and a persistent feeling of cold.

These symptoms are often insidious, may take months to become apparent, and worsen as iron depletion progresses.

Typical epithelial and mucosal manifestations
Iron deficiency causes structural and functional changes in several tissues, particularly rapidly renewing epithelial tissues:

• Atrophic glossitis: a smooth, erythematous, painful tongue, sometimes fissured and sensitive to hot or acidic foods.
• Angular cheilitis: fissures and cracks at the corners of the mouth, often painful and prone to secondary infection.
• Koilonychia: thin, brittle, spoon-shaped nails (a typical sign of chronic iron deficiency).
• Skin changes: dry skin, diffuse pallor, a tendency to fissuring, and occasionally diffuse alopecia.

When present, these signs suggest prolonged deficiency and support the clinical suspicion of longstanding iron deficiency.

Neurocognitive, immune, and psychological symptoms and signs
In children and adolescents, iron deficiency may manifest with:

• Neurocognitive developmental disturbances, deficits in attention and memory, slower school learning, irritability, and apathy.
• Immune function: iron deficiency may alter some immune responses, but the association with a clinically defined increase in infections is heterogeneous and does not support recurrent infections as a specific manifestation.

In adults and older people, the neuropsychological presentation may include cognitive decline, mood changes, insomnia, and worsening quality of life.

Restless legs syndrome
Iron deficiency is also associated with restless legs syndrome, particularly when iron stores are low; this association does not imply that the syndrome is present in all patients with iron deficiency.

Behavioral manifestations: pica
In some populations, such as children and pregnant women, iron deficiency is frequently associated with pica, a compulsive desire to ingest nonfood substances such as soil, ice, paper, or starch, with possible gastrointestinal complications.

Cardiovascular signs and systemic adaptation
The cardiovascular adaptive response to chronic tissue hypoxia includes:

• Resting tachycardia and increased cardiac output, particularly in older people or those with underlying heart disease.
• Anemic flow murmurs with a systolic ejection pattern, often audible on precordial auscultation, caused by increased blood flow velocity.
• Signs of heart failure (dyspnea at rest, dependent edema, jugular venous distention) in severe cases, particularly in individuals with reduced functional reserve.

When present, these signs suggest severe chronic anemia or reduced compensatory capacity.

Clinical variability according to age and comorbidities
In older individuals or those with comorbidities such as heart failure, COPD, or chronic kidney disease, iron deficiency anemia may exacerbate pre-existing disease, worsen baseline symptoms, and increase the risk of adverse events such as falls, delirium, and exacerbations. In young children and adolescents, iron deficiency is associated with impaired growth and psychomotor development; outcomes after correction vary according to age, duration, severity, and confounding factors.

Special clinical settings
In pregnant women, iron deficiency is frequently asymptomatic in the early stages but may be associated with an increased risk of preterm birth, low birth weight, and maternal and fetal complications in more advanced cases.
In athletes, symptoms may be subtle and present as reduced performance and early fatigue.

The diagnostic approach to iron deficiency anemia requires a sequential, rational, and integrated assessment of history, clinical findings, and laboratory data to confirm the diagnosis, identify its cause, and establish the appropriate therapeutic strategy. An incomplete or superficial evaluation may delay recognition of potentially serious underlying conditions such as occult bleeding, neoplasia, or malabsorption.

Medical history
The medical history is the first fundamental step in directing clinical suspicion and guiding the selection of subsequent investigations. It should systematically assess:

• Diet: assessment of the quality and quantity of iron intake, dietary restrictions (vegetarianism, veganism, low-calorie diets), and cultural and social habits.
• Blood loss: presence of menorrhagia, metrorrhagia, gastrointestinal bleeding (hematemesis, melena, hematochezia), hematuria, recurrent epistaxis, and frequent blood donation.
• Medical history: known gastrointestinal disorders (celiac disease, Crohn disease, gastrectomy, intestinal surgery), symptoms suggestive of malabsorption (chronic diarrhea, steatorrhea, weight loss), and chronic use of medications that reduce iron absorption (proton pump inhibitors, antacids, chelating agents).
• Comorbidities: kidney failure, chronic inflammatory diseases, neoplasms, and psychiatric disorders.
• Family history: anemia, hemoglobinopathies, bleeding disorders, or congenital disorders of iron metabolism.

A focused history often makes it possible to identify the likely predominant pathogenetic mechanism (reduced intake, losses, malabsorption, or increased requirements) and select the most appropriate laboratory and instrumental investigations accordingly.

Physical examination
The physical examination should be comprehensive and directed toward identifying both general signs of anemia and typical manifestations of iron deficiency, as well as possible underlying causes. The main findings include:

• Pallor of the skin and mucous membranes: assessed particularly in the conjunctivae, oral mucosa, palms, and nail beds.
• Epithelial signs: atrophic glossitis, angular cheilitis, koilonychia, and trophic changes of the skin and its appendages.
• Cardiovascular signs: tachycardia, bounding pulse, systolic flow murmurs, and possible signs of heart failure in patients with pre-existing heart disease.
• Neurologic and neuropsychological signs: weakness, irritability, difficulty concentrating, and, in children, impaired growth and neuropsychological development.
• Signs of a possible bleeding source: bruising and petechiae suggest a hemostatic disorder or associated source of blood loss, not iron deficiency itself.

Systematic assessment of these signs often provides valuable information for identifying the cause of iron deficiency and evaluating the functional impact of anemia.

Laboratory tests: diagnostic confirmation and characterization
Laboratory diagnosis of iron deficiency anemia is based on an integrated panel of tests whose sequential interpretation allows both confirmation of iron deficiency and differentiation from other forms of microcytic anemia.
The typical laboratory evaluation includes:

• Complete blood count: it may show initially normocytic and later microcytic, hypochromic anemia, with reduced MCV and MCH in established disease, anisopoikilocytosis in advanced forms, and possible reactive thrombocytosis.
• Serum ferritin: the most sensitive marker of iron-store depletion; its reduction precedes the development of overt anemia. Values below 30 ng/mL are strongly suggestive of iron deficiency, but falsely normal or elevated levels may occur with inflammation or liver disease.
• Serum iron and transferrin saturation: progressively reduced; transferrin saturation is often below 20%, but it should be interpreted in light of inflammation, comorbidities, and the clinical context.
• Total transferrin: increased through a compensatory mechanism (hypertransferrinemia), especially in established disease.
• Soluble transferrin receptor (sTfR): increases early in iron deficiency and is particularly useful in cases associated with chronic inflammation.
• sTfR/log(ferritin) index: provides integrated information on functional iron deficiency and iron stores.
• Serum hepcidin (if available): reduced in isolated iron deficiency anemia and increased in anemia of chronic disease/inflammation.

Combined interpretation of these parameters makes it possible to confirm the diagnosis, quantify the severity of deficiency, and distinguish isolated iron deficiency from mixed forms or those secondary to chronic disease.

Targeted diagnostic investigations
When iron deficiency anemia has been confirmed but no cause is evident, the diagnostic strategy should be guided by clinical suspicion using a stepwise approach:

• Investigation of the source of blood loss: gastrointestinal evaluation depends on age, sex, symptoms, and risk factors. Bidirectional endoscopy is generally indicated in men and postmenopausal women; in premenopausal women, the decision is individualized. Fecal occult blood testing does not replace endoscopy when endoscopy is indicated.
• Evaluation for malabsorption: serologic testing for celiac disease with endoscopic confirmation when indicated, investigation of specific causes suggested by the history, and assessment for parasitic infections in compatible epidemiologic settings. Breath testing for small intestinal bacterial overgrowth is not a routine investigation for iron deficiency anemia.
• Testing for Helicobacter pylori: in patients with iron deficiency anemia without an identified cause, particularly after a negative endoscopic evaluation when indicated, noninvasive testing for H. pylori may be appropriate, with treatment if infection is documented.
• Imaging and instrumental investigations: abdominal ultrasonography, MRI, CT, targeted gynecologic investigations in the presence of specific symptoms, and, when appropriate, oncologic evaluation if risk factors or alarm symptoms are present.

The goal is always to identify the primary cause and, when possible, eliminate it, because persistence of the cause increases the risk of an incomplete response or recurrence after iron therapy.

Differential diagnosis
Not all microcytic, hypochromic anemias are caused by iron deficiency; the differential diagnosis should always include:

• Anemia of chronic disease/inflammation (chronic inflammation, neoplasia): in these cases iron stores may be normal or increased, but iron is not bioavailable for erythropoiesis. Ferritin is normal/high, serum iron is low, transferrin saturation is low, and hepcidin is elevated.
• Anemia of chronic kidney disease: it is generally multifactorial, with a central role for reduced erythropoietin production or response; inflammation, functional iron restriction, and absolute iron deficiency may coexist.
• Thalassemias: microcytic anemia with very low MCV; in the absence of iron deficiency or overload, iron parameters may be normal, whereas concomitant iron deficiency lowers them and transfusions or iron overload may increase them. The erythrocyte count is often relatively high for the degree of anemia.
• Sideroblastic anemias: rare disorders associated with increased iron stores and ring sideroblasts in the bone marrow.
• Other causes: lead poisoning, congenital deficiencies of erythropoietic enzymes, and rare chronic conditions.

Proper integration of history, clinical findings, laboratory data, and instrumental investigations is essential for an accurate diagnosis and to avoid therapeutic errors.

Follow-up and monitoring
After diagnosis and correction of the deficiency, periodic follow-up is recommended in at-risk patients (women of reproductive age, children, older adults, and people with chronic disease), with monitoring of the complete blood count, ferritin, transferrin saturation, and, when indicated, specific tests to monitor the primary cause. Careful follow-up allows early identification of recurrence or new predisposing conditions.

Treatment of iron deficiency anemia is based on an integrated approach that includes correction of iron deficiency, elimination of the underlying causes and prevention of recurrence. Effective management requires accurate identification of the etiology, because persistence of the cause may result in an incomplete response to iron therapy and promote recurrence.

Iron therapy: choice of route of administration
The administration of iron is the cornerstone of treatment. Oral iron is the first-line treatment in most cases because of its efficacy, ease of use, and safety. The most commonly used preparations are:

• Ferrous sulfate
• Ferrous fumarate
• Ferrous gluconate

In adults, oral iron should be administered no more than once daily; alternate-day dosing may improve tolerability and absorption in some patients. Administration on an empty stomach improves absorption but may reduce tolerability; vitamin C is not routinely required. In children, dosing should be adjusted to body weight and specific growth requirements.
Gastrointestinal adverse effects (nausea, abdominal pain, diarrhea or constipation, metallic taste) are common and may impair adherence; tailoring the formulation, adjusting the dose, and taking iron with a light meal can often improve tolerability.

Indications for intravenous iron therapy
The intravenous iron is indicated in the following situations:

• Documented intestinal malabsorption (refractory celiac disease, intestinal resection, gastrointestinal bypass syndromes, severe pancreatic insufficiency)
• Severe and persistent intolerance to oral iron salts
• Severe anemia with cardiorespiratory symptoms or the need for rapid restoration of hemoglobin levels (advanced pregnancy, preoperative preparation for major surgery, patients with critical comorbidities)
• Documented poor adherence or inability to administer oral therapy

Modern parenteral formulations (ferric carboxymaltose, ferric derisomaltose, or other locally available formulations) allow safe and rapid administration of high doses. Severe hypersensitivity reactions are rare but require monitoring; the safety profile and risk of hypophosphatemia vary among formulations, particularly with ferric carboxymaltose. The choice of formulation and dose should be individualized according to the total iron deficit, which may be estimated when appropriate using the Ganzoni formula, and the patient's overall clinical condition.

Correction of the underlying cause and prevention strategies
Identification and management of the primary cause of iron deficiency are essential for long-term therapeutic success. Depending on the etiology, strategies include:

• Treatment of chronic blood loss (removal of polyps or uterine fibroids, management of gastrointestinal disease, treatment of bleeding hemorrhoids, correction of menorrhagia with hormonal or surgical therapy, and management of recurrent epistaxis)
• Management of malabsorption (gluten-free diet in celiac disease, treatment of inflammatory bowel disease, enzyme supplementation, and treatment of parasitic infestations)
• Optimization of dietary intake (nutrition education and use of supplements when indicated on the basis of intake, iron status, and applicable recommendations)
• Review of current medications and, when possible, discontinuation or substitution of medications that interfere with iron absorption

Primary and secondary prevention also include screening programs in at-risk populations, perinatal supplementation during pregnancy and infancy, and long-term monitoring in individuals with nonremovable or recurrent causes.

Monitoring the therapeutic response
The response to iron therapy can generally be assessed within a few weeks after treatment begins. Parameters to monitor include:

• Reticulocyte response: an increase in reticulocytes 7-10 days after treatment begins, an early sign of an effective bone marrow response.
• Gradual increase in hemoglobin: an adequate response often produces an increase of approximately 1 g/dL within 2-4 weeks; the time to normalization varies with severity, cause, adherence, and persistence of blood loss.
• Repletion of iron stores: once hematologic values have normalized, iron therapy should be continued for at least 2-3 months to adequately replenish iron stores, with periodic monitoring of the complete blood count, ferritin, and transferrin saturation.

Failure to respond should always prompt diagnostic reassessment to exclude inadequate adherence, persistent occult blood loss, concomitant chronic disease, or errors in interpretation of the laboratory findings.

Prognosis
The prognosis of iron deficiency anemia is favorable when treatment is initiated promptly and the underlying cause is eliminated or controlled. Hematologic parameters generally normalize and symptoms resolve relatively quickly; however, chronic untreated forms are associated with adverse neurodevelopmental and obstetric outcomes; the risk depends on severity, timing, cause, treatment, and confounding factors, and it is not appropriate to assume universally irreversible damage. In patients with cardiovascular comorbidities or multiple chronic conditions, iron deficiency anemia is associated with greater morbidity and lower survival; the magnitude of the association depends on the underlying disease and other confounding factors. Forms of refractory iron deficiency (lack of response to appropriately administered iron therapy) always require further investigation to exclude unrecognized conditions (malignancies, chronic inflammatory diseases, malabsorption syndromes) and, in appropriate cases, rare inherited forms such as iron-refractory iron deficiency anemia (IRIDA) associated with variants in TMPRSS6. Long-term monitoring, particularly in at-risk populations, is essential to prevent recurrence and maintain adequate iron status.

The complications of iron deficiency anemia result both from prolonged iron deficiency and from the reduced oxygen-carrying capacity caused by anemia. The impact of these complications is particularly important in vulnerable populations such as children, pregnant women, older adults, and patients with comorbidities, in whom iron deficiency may be associated with systemic consequences that can sometimes persist depending on severity, duration, timing, and treatment.

Neurologic and developmental complications
In children and adolescents, chronic iron deficiency may substantially impair neurodevelopment. Iron is essential for myelination, maturation of neural circuits, and neurotransmitter synthesis:

• Neurocognitive impairment: impaired memory, reduced attention, learning difficulties, and delayed psychomotor development, with effects that do not fully normalize in some studies, although persistence varies with duration, age, treatment, and confounding factors.
• Behavioral disturbances: irritability, apathy, sleep disturbances, and mood changes.

These complications, which are often underestimated, may persist even after correction of anemia if not treated early.

Cardiovascular complications
Iron deficiency anemia reduces tissue oxygen delivery and activates cardiovascular compensatory mechanisms. In predisposed individuals, this may lead to:

• High-output heart failure: sustained compensatory tachycardia and increased cardiac output may precipitate heart failure, particularly in patients with pre-existing cardiovascular disease or impaired ventricular function.
• Angina and myocardial ischemia: in patients with coronary artery disease, reduced oxygen-carrying capacity may facilitate the onset of ischemia, even in the absence of significant stenoses.
• Anemic flow murmurs and predisposition to arrhythmias, particularly in severe anemia.

In young children, the risk of congestive heart failure is increased by the limited functional reserve of the developing heart.

Impaired physical performance and growth
Iron deficiency reduces the production of myoglobin and numerous mitochondrial enzymes, with adverse effects on muscle function and exercise tolerance:

• Reduced physical endurance, early fatigability, and slower muscle recovery, affecting quality of life and participation in sports.
• Growth delay: in children, chronic iron deficiency may adversely affect growth and pubertal maturation.

These complications can be particularly disabling for adolescents and athletes.

Immune function
Iron is essential for normal function of both the innate and adaptive immune systems. Iron deficiency causes:

• Changes in some immune parameters have been described, but their clinical significance and relationship with recurrent infections have not been consistently demonstrated.
• Iron deficiency alone has not been shown to specifically cause delayed wound healing; risk depends mainly on perfusion, overall nutritional status, infection, and comorbidities.

Correction of iron deficiency should be guided by the clinical indication and underlying cause, without assigning it a role in antimicrobial prophylaxis.

Epithelial changes and mucocutaneous complications
Iron deficiency causes structural changes in epithelial tissues:

• Glossitis, angular cheilitis, and koilonychia; fissures from angular cheilitis may be associated with local bacterial or fungal infections.
• Trophic skin changes, with dryness, fissuring, and skin fragility; ulcers are not a specific complication of iron deficiency, particularly in older or bedridden individuals.

If neglected, these signs may cause substantial secondary morbidity.

Obstetric and neonatal complications
In pregnant women, iron deficiency is associated with a higher incidence of:

• Preterm birth and low birth weight
• Higher risk of postpartum hemorrhage, with a possible need for transfusion
• Increased maternal and fetal mortality in the presence of severe uncorrected iron deficiency

In at-risk women, assessment and correction of iron deficiency before conception or during pregnancy should be performed according to the clinical context and applicable guidelines; not all guidelines recommend universal preconception treatment.

Behavioral complications and pica
The pica, defined as the compulsive desire to ingest nonfood substances such as soil, ice, paper, or starch, is a clinical sign suggestive of iron deficiency and may also cause:

• Gastrointestinal complications: obstruction, perforation, parasitic infections, or toxicity from ingestion of contaminated substances.

Early recognition and correction of iron deficiency usually lead to rapid resolution of the behavior.

Prevention and management of complications
Prevention of complications from iron deficiency anemia is based on three pillars:

• Early screening and timely diagnosis in at-risk groups (children, pregnant women, older adults, patients with chronic blood loss or malabsorption)
• Appropriate and timely treatment of iron deficiency and its underlying causes
• Ongoing monitoring of vulnerable populations to prevent recurrence and reduce the impact of long-term sequelae

A proactive approach can minimize morbidity and reduce the risk of persistent complications, improving the patient's overall prognosis.