Pericarditis pain or heart attack:
how to tell them apart and what to do

Article written and reviewed by Dr Luca Moretti

Pericarditis pain and heart attack pain can have different characteristics, but there is no rule based on symptoms alone that can distinguish them safely at home. Pericarditis often causes sharp pain that worsens with deep breathing or when lying down and improves when leaning forward; a heart attack more often causes pressure, heaviness, tightness, or squeezing in the center of the chest. In practice, however, both conditions may present less typically.
New, severe, persistent chest pain or pain associated with shortness of breath, sweating, nausea, fainting, marked weakness, or radiating pain should be considered potentially urgent. In this situation, you should not wait to work out whether it is pericarditis: you should call 112 or 118.

Pericarditis is inflammation of the sac surrounding the heart; myocardial infarction, by contrast, results from ischemic damage to the heart muscle, in most cases caused by an acute problem in a coronary artery. The causes are therefore different, but the initial symptom may be the same: chest pain.

How pericarditis pain most often presents

Classic pericardial pain is acute, sharp, and pleuritic. It therefore tends to intensify during a deep breath, with coughing, or with other movements that increase the sliding and tension of inflamed structures. A positional component is also common: lying down may make it worse, while sitting up and leaning the torso slightly forward may reduce it.
The pain is often retrosternal or precordial, but its location can vary and it may extend to the shoulder or trapezius ridge. Fever, fatigue, and palpitations may be present. These features make pericarditis more compatible with the clinical picture, but none is sufficiently specific to exclude other causes of chest pain.

Another feature that may help is the course of symptoms: pain from acute pericarditis may persist for hours or days with fluctuations in intensity and may be influenced by breathing and posture. This pattern should not, however, be applied rigidly. Some cases of pericarditis cause pain that is less "textbook", while a patient with myocardial ischemia may describe an unusual symptom, particularly in the presence of diabetes, advanced age, or other conditions that alter pain perception.

How heart attack pain most often presents

In a heart attack, the best-known symptom is pressure-like chest pain or discomfort, often described as heaviness, pressure, a tight band, crushing, or intense burning. It may radiate to one or both arms, the shoulders, back, neck, jaw, or upper abdomen. It may also be associated with shortness of breath, sweating, nausea, vomiting, weakness, or a feeling of faintness.
The pain does not have to be extremely severe. A heart attack may begin gradually, be intermittent, or present mainly with breathlessness, nausea, unusual fatigue, or other symptoms. The absence of left-arm pain also rules nothing out: radiation may occur elsewhere or be completely absent.

Pain that does not change with position and does not worsen with breathing is more compatible with an ischemic origin than classic pericardial pain, but this is still only a clinical probability. The decision to wait at home should not depend on self-assessing the type of pain. Acute coronary syndromes are time-dependent conditions, and the initial goal is to identify or exclude them rapidly.

Why ECG and troponin may also require interpretation

The distinction is not based simply on whether the ECG is "normal" or "abnormal". Pericarditis can cause ST-segment elevation, often diffuse, and PR-segment depression. A myocardial infarction with ST-segment elevation, by contrast, tends to produce changes distributed according to the territory of the affected coronary artery and may be associated with reciprocal changes. These patterns are useful to clinicians, but they may be incomplete or non-classic.
In addition, the ECG in pericarditis may be nonspecific or may not show the traditional pattern at all. Diagnosis therefore always integrates the tracing with the clinical history, physical examination, and other available data.

Troponin also requires interpretation. In isolated pericarditis it may remain normal; if it rises, there may be involvement of the heart muscle, as in myopericarditis, but an increase in troponin is also a key finding in the diagnosis of myocardial infarction and may occur in many other cardiac and systemic conditions. It is therefore not a test that, by itself, automatically "tells" which of the two diagnoses is correct.
Echocardiography helps identify any effusion, assess cardiac function, and look for regional wall-motion abnormalities. In selected cases, cardiac magnetic resonance imaging can provide information on the presence and distribution of inflammation in the pericardium and myocardium.

When you should not try to distinguish them at home

If pain is new, severe, persistent, or associated with systemic symptoms, the priority is not to decide independently which diagnosis seems more likely. Marked shortness of breath, cold sweating, severe nausea, feeling faint, loss of consciousness, marked weakness, low blood pressure, radiating pain, or rapid worsening should particularly increase concern.
The same applies to someone who has previously had pericarditis: a recurrence can certainly reproduce familiar pain, but a previous history does not protect against another disease. Automatically attributing every new episode of pain to pericarditis can delay the diagnosis of a coronary event or another emergency.

When symptoms are compatible with a cardiac emergency, 112 or 118 should be called immediately and the patient should not drive. The emergency medical system allows early assessment and appropriate transport when necessary.
If, instead, the pain is mild, has already been evaluated, and is part of a known pericarditis picture, any significant change from usual symptoms, the onset of high fever, increasing breathlessness, or failure to respond to prescribed treatment should still prompt medical reassessment.

How the distinction is made in hospital

The initial assessment of chest pain first considers conditions requiring immediate treatment. The characteristics of the pain and risk factors are reviewed, an ECG is performed, and biomarkers are measured, particularly troponin. Tests may be repeated over time because a single initial result is not always conclusive.
When pericarditis is suspected, inflammatory markers and echocardiography are also included in the assessment. A pericardial effusion may support the diagnosis, but its absence does not exclude the disease. Cardiac magnetic resonance imaging is particularly useful when inflammation needs to be documented or possible myocardial involvement clarified.

The practical conclusion is simple: some features of the pain can make one diagnosis more plausible than the other, but chest pain is not a diagnostic test. Correct distinction requires combining symptoms, ECG, biomarkers, and imaging, selecting tests according to risk and the clinical context.

Frequently asked questions about pericarditis and heart attack

How can pericarditis pain be distinguished from heart attack pain?
Pericarditis is often sharp, pleuritic, and positional; a heart attack more often causes pressure or tightness. These features can overlap, however, and cannot rule out a heart attack without medical assessment.

Can pericarditis look like a heart attack on an electrocardiogram?
Yes. It can cause ST-segment elevation and other changes that require interpretation in the clinical context.

Can troponin increase in pericarditis?
It may rise if the myocardium is also involved. An elevated troponin alone does not distinguish myopericarditis from myocardial infarction and must be interpreted together with the other findings.

If the pain improves when leaning forward, is it definitely pericarditis?
No. It is a suggestive feature, not diagnostic proof.

When should 112 or 118 be called for chest pain?
When pain is new, severe, or persistent, or is associated with shortness of breath, sweating, nausea, fainting, marked weakness, or radiating pain, emergency services should be called immediately.