A burst of heart tightness may be caused by certain physiological factors, may also be a symptom of various organic heart diseases, such as coronary heart disease, heart failure, etc., may also be caused by digitalis intoxication, the emergence of persistent or progressive tightness of the heart performance, should be promptly consulted to identify the cause. 1. Physiological factors: strenuous exercise, drinking excitatory beverages, excessive anxiety or nervousness, etc., may lead to a burst of tightness in the heart, at this time you need to stop or lift the trigger, generally can be relieved on their own, without special treatment. 2. Coronary heart disease: coronary artery atherosclerosis caused by narrowing or occlusion of the lumen, myocardial ischemia, hypoxia or necrosis, the patient may feel the discomfort of the heartbeat or panic, accompanied by chest pain and dizziness and other manifestations. Arrhythmias can be caused when the blood supply to the heart is insufficient or when damage to heart tissue interferes with the heart’s electrical impulses. Therefore, a bout of heart tightness may be caused by coronary artery disease. 3. Heart failure: Due to the diastolic and systolic dysfunction of the heart muscle, the volume of blood discharged by the heart is not enough to maintain the metabolic needs of the tissues, and circulatory dysfunction can occur, thus causing a burst of tightness of the heart, which can be accompanied by dyspnea, limited physical activity and other symptoms. 4. Digitalis toxicity: an excessive intake of digitalis drugs or chronic accumulation can lead to digitalis toxicity, arrhythmia and myocardial contractility changes, the patient may feel a burst of heart tightness. The symptoms of a burst of heart tightness, exclude physiological factors, should promptly consult the doctor, improve the relevant examination, and carry out the cause of the treatment.