What causes a fast heartbeat without feeling nervous, and what should be done?

A fast heartbeat without anxiety may be related to intense exercise, viral myocarditis, coronary atherosclerotic heart disease, and other causes. It can be managed through daily care, oral medications, and other methods. Specific analyses are as follows:

1. Intense Exercise

Intense physical activity may stimulate the sympathetic nervous system, leading to an increased heart rate. This condition does not require special treatment and typically resolves after rest.

2. Viral Myocarditis

Viral myocarditis is caused by a viral infection. If the infection leads to excessive activation of the sympathetic nervous system, it may result in a rapid heartbeat. Patients may take antiviral medications such as ribavirin tablets or acyclovir tablets as directed by a physician.

3. Coronary Atherosclerotic Heart Disease

Coronary atherosclerotic heart disease can cause oxygen deficiency in the body, which may overstimulate the sympathetic nervous system and lead to a fast heartbeat. Patients may take medications such as metoprolol tartrate tablets or sotalol hydrochloride tablets as prescribed by a doctor.

In addition to the common causes mentioned above, this symptom may also be associated with hypertensive heart disease, rheumatic heart disease, and others. If symptoms persist or fail to improve, prompt medical evaluation at a hospital is recommended.