The red face after exercise usually has the following factors: 1, the most common factor is the increase in body temperature after exercise, usually after exercise will release a lot of heat and heat factors in the body, which will lead to increased heat production, there will be a rise in body temperature, when the body temperature rises there will be facial flushing, tachycardia. 2, after exercise will provoke abnormal excitation of the sympathetic nerve in the body, when the sympathetic nerve is excited. The body will secrete renin-angiotensin-aldosterone system at this time, in this will be the secretion of hormones will appear flushed face, tachycardia, increased blood pressure, pulse rate, shortness of breath and a series of physiological changes. 3, after exercise the body will release inflammatory mediators, such inflammatory mediators, such as lactic acid and other factors will lead to increased capillary permeability, will also lead to the case of red face.