The hazards that occur in sinus tachycardia are: i. The blood supply to the heart is affected because in sinus tachycardia, atrial and ventricular contractions are affected, resulting in a decrease in cardiac output. Second, patients may experience heart weakness, panic, angina, chest tightness, weakness, dizziness and other uncomfortable symptoms, and in severe cases, even fainting. III. Long-term sinus tachycardia can lead to hypertension and myocardial ischemia, causing heart failure. IV. Acute pulmonary edema. V. Sudden cardiac death. If patients have sinus tachycardia, they should go to the hospital early for examination and symptomatic treatment to avoid causing complications. The typical symptom of sinus tachycardia is an accelerated heartbeat, which will exceed the frequency of 100 beats per minute. Patients with dyspnea, dizziness and chest tightness need to go to a regular hospital for treatment in time to avoid danger.