The pain in the middle of the commission may be due to localized invasion of wind, cold and dampness in the knee joint, poor circulation of local qi and blood, or deficiency of kidney qi, impaired bladder function, etc. The pain in the middle of the commission is located in the middle of the popliteal fossa. The point is located in the middle of the popliteal fossa and belongs to the foot solar bladder meridian. If there is pain in the middle of the commission, first of all, it is more likely that the knee joint has been invaded by wind, cold and dampness, resulting in poor circulation of qi and blood in the knee joint and stagnation of qi and blood stasis (blood stagnation due to the lack of qi flow), which leads to pain. This kind of pain is the so-called “pain without communication” in Chinese medicine. In addition, according to the meridian theory of traditional Chinese medicine, the state of the acupoints can reflect the functional state of the meridians and the internal organs they contact. Therefore, the commission in the pain, may be its contact with the viscera dysfunction related, such as bladder qi function disorder, will appear urinary discharge is not smooth, edema and other phenomena. Therefore, when the pain in the middle of the Commission, it is recommended to seek medical treatment in a timely manner, and ask a professional physician to carry out diagnosis, judgment and treatment.