Heart palpitations are feelings or sensations that your heart is pounding or racing. They can be felt in your chest, throat, or neck. You may have an unpleasant feeling that your heart skipped or stopped beats.
Palpitations are not serious most of the time. However, sensations representing an abnormal heart rhythm (arrhythmia) may be more serious.
The following conditions make a person more likely to have an abnormal heart rhythm:
- Known heart disease at the time the palpitations begin
- Significant risk factors for heart disease
- An abnormal heart valve
- An electrolyte abnormality in your blood; for example, a low potassium level
Heart palpitations can be caused by a variety of factors:
- Anxiety, stress, panic attack, or fear
- Caffeine intake
- Nicotine intake
- Cocaine or other illegal drugs
- Diet pills
- Exercise
- Fever
However, some palpitations are due to an abnormal heart rhythm, which may be caused by:
- Heart disease
- Abnormal heart valve, such as mitral valve prolapse
- Abnormal blood level of potassium
- Certain medicines, including those used to treat asthma, high blood pressure, or heart problems
- Overactive thyroid
- Low level of oxygen in your blood
You should consult a doctor if your heart palpitations are accompanied by:
- Chest discomfort or pain
- Fainting
- Severe shortness of breath
- Severe dizziness