Sudden tightness of the heart dizziness and vomiting, may be coronary heart disease, atrial fibrillation or heart failure and other diseases caused by the onset of the need to promptly call 120 for emergency treatment, relieve the cause of the identification of the cause of treatment. 1. Coronary heart disease: the attack is often triggered by physical labor or emotional stress, manifested as discomfort or pain in the anterior region of the heart, lasting 3 to 5 minutes. It is necessary to consult a doctor to find out the cause of the disease, and then use nitroglycerin, betalactam and other drugs as prescribed by the doctor. 2. Atrial fibrillation: the most common arrhythmia, atrial beating loss of systole and diastole, decreased cardiac output. In the event of an attack, the patient should be treated with drugs or anticoagulation in the hospital. 3. Heart failure: reduced ventricular filling or ejection function, insufficient cardiac output leads to insufficient perfusion of blood flow to tissues and organs. The symptoms are dizziness and vomiting, and pain or discomfort in the precordial region when the heart is ischemic. Prompt medical attention is needed for diagnosis under ECG, ultrasound and other tests. Take medication such as metoprolol as prescribed by the doctor. Patients with acute attacks need to do emergency treatment, and actively seek medical attention, when the symptoms are relieved need to cooperate with the doctor to identify the cause of the disease and deal with the original disease. The above drugs should be used under the guidance of a doctor. Do not be over-excited and do not engage in strenuous exercise.