After exercise blood pressure significantly lower if also accompanied by chest tightness, shortness of breath and other phenomena may be caused by heart failure, if only simple blood pressure reduction may be related to physiological factors, it is not heart failure. 1. Heart failure: heart failure is also known as heart failure, usually due to venous return, myocardial diastolic or contractile dysfunction caused by the most important clinical feature is the reduction of cardiac output, tissue blood perfusion reduction, pulmonary circulation and venous stasis in the circulation, especially after strenuous exercise will affect the normal blood supply of the heart heart failure, but also caused by tightness in the chest, shortness of breath, and lower blood pressure. 2. Physiological factors: If too strenuous exercise in a short period of time, it will lead to rapid blood circulation in the body, and blood vessels will be dilated in a short period of time, which will cause a decrease in blood pressure, usually in a short period of time will be relieved. When the blood pressure is lowered, three blood pressure measurements should be made, if there is a significant decrease, then it belongs to the pathologic low blood pressure, and according to the cause of the low blood pressure and the severity of the low blood pressure, strictly in accordance with the doctor’s prescription of medication treatment.