Tachycardia occurs when the heart beats more than 100 times per minute in a quiet state. Tachycardia can be caused by the following factors: 1) physiological factors: prolonged smoking, alcohol, tea, strong coffee, emotional anxiety, excitement, anger, etc.; 2) pathological factors: heart diseases, such as coronary heart disease, cardiac insufficiency, heart failure, etc.; systemic diseases, such as anemia, hyperthyroidism, fever, infection, shock, etc.; 3) drug factors: such as aminophylline, adrenal drugs, which can cause Tachycardia.