Although there is no single identifiable cause, essential hypertension is influenced by a genetic predisposition and numerous environmental risk factors, including smoking, a high-sodium diet, sedentary lifestyle, and chronic stress. Family history plays an important role: individuals with first-degree hypertensive relatives have an increased risk of developing the disease due to genetic variants that alter pressure regulation mechanisms, endothelial function, and water-salt balance.
A non-modifiable risk factor is aging; hypertension incidence increases with age due to vascular changes associated with aging. Over the years, blood vessels lose elasticity and become stiffer, increasing peripheral vascular resistance and contributing to the development of arterial hypertension. Aortic stiffening in the elderly impairs its elastic function, reducing its ability to buffer blood flow and increasing cardiac workload, leading to left ventricular hypertrophy.
At the core of essential hypertension development is a complex interaction of pathogenic mechanisms. Chronic activation of the sympathetic nervous system causes widespread vasoconstriction and increased heart rate, while the renin-angiotensin-aldosterone system (RAAS), often hyperactive, promotes sodium and water retention, increasing plasma volume and pressure. Endothelial dysfunction is also present, characterized by reduced nitric oxide production, the main endogenous vasodilator, and increased vasoconstrictors such as endothelin. Numerous studies have also shown a decreased sensitivity of arterial baroreceptors, responsible for reflex pressure regulation, and increased reactivity to vasoactive mediators such as adrenaline and angiotensin II. In some subjects, a state of low-grade chronic inflammation appears to further contribute to endothelial dysfunction and elevated blood pressure values.
Protective is aerobic physical exercise at least 2-3 times a week for at least 20 minutes. Optimal physical activity is aerobic and maintained below the anaerobic threshold, i.e., the level beyond which the body starts producing excess lactate. A practical method to estimate the optimal heart rate for aerobic activity is to calculate 75% of the theoretical maximum heart rate (220 minus age in years). For example, for a 40-year-old: 75% of (220-40) = 135 bpm.
Arterial hypertension is often asymptomatic, at least for not too high blood pressure values, and detectable only through measurement with a sphygmomanometer. Values above 180 mmHg systolic or 110 mmHg diastolic can be associated with severe symptoms, including intense headache, dizziness, blurred vision, and dyspnea. Even in the absence of obvious manifestations, hypertension represents one of the main factors underlying cardiovascular and renal complications: strict control of blood pressure values is therefore fundamental to reduce the risk of acute events and prevent progressive impairment of target organs.
The main problem of arterial hypertension is that prolonged elevated pressure levels cause chronic alterations, especially cardiac, vascular, and renal, and can cause acute organ damage. Among the modifications associated with high blood pressure are hypertrophic cardiovascular adaptations.
The heart, to compensate for the increased vascular resistance, develops left ventricular hypertrophy, an initially compensatory adaptation that can evolve into heart failure. At the vascular level, vessels exposed to higher pressure undergo thickening and increased stiffness.
At the renal level, high pressure causes glomerular damage, resulting in microalbuminuria, an early marker of hypertensive renal damage. Renal damage is particularly important: as long as only microalbuminuria is present, the condition is still reversible, but if renal damage becomes more significant, a vicious cycle is established: hypertension causes renal damage, which in turn increases hypertension, further worsening renal damage. It is important to emphasize that initial alterations — such as microalbuminuria and early left ventricular hypertrophy — are largely reversible if blood pressure values are normalized and maintained within the normal range. Timely treatment can therefore prevent progression towards irreversible organ damage.
Arterial hypertension represents a very important cardiovascular risk factor, which together with other common risk factors such as diabetes, dyslipidemia (metabolic syndrome), and atherosclerosis, can lead to serious adverse cardiovascular events. For this reason, hypertension management is based on a progressive approach that includes lifestyle modifications — salt reduction, increased physical activity, weight control — and, when necessary, targeted pharmacological therapy.
Since hypertension is often silent, periodic blood pressure monitoring is recommended, easily performed by the general practitioner or even free of charge in pharmacies. Home self-measurement and 24-hour blood pressure monitoring are increasingly recommended tools for accurate diagnosis and to evaluate true risk exposure, overcoming the limitations of isolated office measurements.
Hypertension is defined as persistent blood pressure values above 140 mmHg systolic and/or 90 mmHg diastolic on repeated measurements. However, it should be noted that blood pressure can vary significantly in the same individual and temporarily increase without constituting pathological hypertension. For example, ingestion of licorice, coffee, or cigarette smoke can temporarily raise blood pressure values. Blood pressure is also influenced by emotional and psychological factors, such as stress.
A particular example is white coat syndrome, a condition in which the patient shows increased blood pressure during the medical visit, while values are normal at home. To distinguish between arterial hypertension and occasional pressure increase, 24-hour blood pressure monitoring is recommended to assess the persistence of hypertension during the day.
Based on the severity of blood pressure values, different grades of hypertension are distinguished, associated with higher cardiovascular risk. Obviously, the higher the pressure, the greater the risk of long-term complications. Very high blood pressure values are also dangerous immediately, with the risk of acute organ damage.