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A heart that beats irregularly, too fast or too slow, is experiencing an arrhythmia.

Pericarditis symptoms may be similar to those of heart attack and include chest pain and abnormal heart rhythms.

To the casual observer, a person with Friedreich ataxia may seem to be drunk.

A doctor may recommend an electrocardiogram for patients who may be at risk of heart disease because of family history, smoking, overweight, diabetes or other conditions.

Wolff-Parkinson-White syndrome is characterised by attacks of rapid heart rate or tachycardia.

Common causes of fainting include heat, pain, distress, the sight of blood, anxiety and hyperventilating.

People with post-traumatic stress disorder often experience feelings of panic or extreme fear, which may resemble what was felt during the traumatic event.

Atrial fibrillation (AF) is a type of arrhythmia, which means that the heart beats fast and abnormally.

The heart is about the size of a clenched fist and lies in the middle of your chest, behind and slightly to the left of your breastbone.

Find out about the long-term symptoms and effects of COVID-19.