High blood pressure after activity may be caused by physiological conditions or factors such as renal artery stenosis and pheochromocytoma. 1. Physiological situation: during activity, the sympathetic nerve of the body is excited, the oxygen consumption of the heart muscle will increase, and the body will ensure that the heart can have enough blood supply by contracting the peripheral blood vessels. When the peripheral vasculature contraction, it may cause the blood pressure to rise. Therefore, high blood pressure after activity may be a physiological situation. 2. Renal artery stenosis: Exercise may cause a decrease in renal blood flow, and if you have renal artery stenosis, it may lead to renal ischemia. Renal ischemia can increase the levels of renin and angiotensin in the body, and these substances have the effect of increasing blood pressure. High blood pressure after activity may be caused by renal artery stenosis. 3. Pheochromocytoma: Pheochromocytoma is a kind of neuroendocrine tumor, which can secrete catecholamines. Exercise may make the tumor cells secrete exuberantly. Since catecholamines have the effect of elevating blood pressure, high blood pressure after activity may be caused by pheochromocytoma. When the situation of high blood pressure after activity occurs, you should consult a doctor in time, improve 24-hour dynamic blood pressure monitoring, renal artery ultrasound, CT and other examinations under the guidance of the doctor, to clarify the cause of the disease, and actively treat it.