There are two main reasons why clinical patients may experience facial flushing when running: First, the body generates more heat under the condition of mass exercise, resulting in peripheral capillary dilation and congestion, which may manifest as facial flushing. Secondly, when exercising, especially in the case of heavy exercise, the body will cause sympathetic excitation, peripheral blood vessels will also lead to expansion, while playing the role of heat dissipation, the patient will appear sweating. The above two aspects will lead to flushing of the face of the runner, which is a normal phenomenon and a reaction of physiological regulation. After the exercise disappears, the body’s automatic adjustment will return to normal, and it is not a clinical reaction to any pathological disease. If there are no other symptoms, there is no need to worry.