This symptom is most likely due to synovitis of the knee joint. Synovitis is divided into two types: acute and chronic. If the symptoms have just appeared, depending on the symptoms, you should choose to take oral herbal tonics such as Tao Hong Si Wu Tang, Wu Tou Tang, or Rejuvenating Palsy Tang, together with western medicines such as Mai Zhi Ling Tablets, Vigorous Tablets, and Fenbid, and apply topical anti-stasis and pain relief cream. During the immobilization period, local acupuncture treatment, massage treatment or non-thermal physical therapy such as magnetic therapy, electrotherapy, ultrasonic therapy, etc. can be used to relieve the symptoms. If the symptoms have been present for a long period of time, oral treatment with Duluxuosheng Tang, Liu Wei Dihuang Wan or Jin Kui Kidney Qi Wan, external application of Wan Ying Cream, oral treatment with Xilabao and Vigorix, and preferably with acupuncture treatment, choosing effective acupoints such as Calvary Point, Blood Sea Point, Yin Ling Quan Point, Yang Ling Quan Point, etc., plus manual acupuncture point treatment, are more effective.