The most common cause of heart fever is caused by arrhythmia, which can manifest as palpitations, panic attacks, and heart fever. Arrhythmias can be seen in physiological as well as pathological states, as follows: 1. Physiological arrhythmias are most often seen in states such as strenuous exercise and emotional excitement, as well as in functional disease states such as cardiac neurosis. 2. For pathological arrhythmias, they are commonly seen in various types of organic heart disease. There are also endocrine diseases, such as abnormal thyroid function, which can lead to arrhythmias. For electrolyte disorders and infectious diseases, they can also cause arrhythmias. For heart fever, it is necessary to pay attention to exclude the possibility of infectious diseases, and it is recommended to give systematic related treatment. In addition, patients should pay attention to actively exclude the possibility of heart failure and other states.