What causes a fast heartbeat when lying flat?

In general, a fast heartbeat while lying flat may be caused by factors such as mental stress, intense exercise, arrhythmia, myocarditis, or coronary atherosclerotic heart disease. It is recommended to seek medical attention promptly, and symptoms can be improved through general management or medication under medical guidance. Specific analyses are as follows:

1. Mental Stress

Long-term excessive mental stress may lead to overexcitation of the sympathetic nervous system, resulting in symptoms such as increased heart rate and rapid breathing. Maintaining a positive mindset and listening to soothing music may help alleviate negative emotions.

2. Intense Exercise

Engaging in vigorous physical activity may accelerate blood circulation, leading to symptoms like rapid breathing and increased heart rate. This is considered a normal physiological response and typically does not require specific treatment.

3. Arrhythmia

This may be related to improper diet, intense exercise, or other factors that disrupt the heart's conduction system, causing symptoms such as palpitations and chest tightness. Patients may take medications such as metoprolol tartrate tablets, bisoprolol fumarate tablets, or verapamil hydrochloride tablets under a doctor’s supervision to improve symptoms.

4. Myocarditis

This condition may result from infections, excessive fatigue, or other causes, potentially leading to symptoms such as chest tightness and chest pain, and may also cause a rapid heartbeat. Patients may be treated with medications such as amoxicillin capsules, cefixime capsules, or ganciclovir tablets as directed by a physician.

5. Coronary Atherosclerotic Heart Disease

This may be associated with physical exertion, emotional excitement, or other factors, possibly causing chest pain and shortness of breath. As the condition progresses, an increased heart rate may also occur. Under medical guidance, patients may use medications such as enteric-coated aspirin tablets, atorvastatin calcium tablets, or nitroglycerin tablets to relieve symptoms.

In daily life, it is important to get adequate rest, ensure sufficient sleep, avoid staying up late, and engage in appropriate outdoor activities such as walking or calisthenics, which may aid in recovery.