Bradycardia, chest tightness, shortness of breath, may be sick sinus node syndrome, or hypothyroidism, myocardial ischemia and other diseases, according to the cause of the reasonable use of medication, etc., and pay attention to rest. 1. Sick sinus node syndrome: Bradycardia, chest tightness, shortness of breath, panic and other symptoms may occur. If the symptoms are severe or there is a history of blackout or syncope, a pacemaker can be implanted to maintain the heart rate if necessary. 2. Hypothyroidism: it is caused by insufficient thyroid hormone and should be supplemented with levothyroxine in time. 3. Myocardial ischemia: it is easy to lead to insufficient blood supply to the heart, causing chest tightness and shortness of breath. Attention should be paid to rest during the attack, reduce the amount of activity, and if necessary, timely oxygen intake is needed to ensure sufficient oxygen. And then through oral nitroglycerin, isosorbide nitrate vasodilatation. Heart rate slowing serious people should promptly consult the doctor. Bradycardia, chest tightness and shortness of breath can not accurately analyze the cause and type of disease, at present, should be consulted as soon as possible, and diagnostic analysis through electrocardiography, cardiac ultrasound, if found to have organic lesions, it is recommended to timely treatment.