When the muscles near the knee joint show symptoms of self-beating, the first thing to consider is the following two aspects: First, it is common that the muscles near the knee joint repeatedly contract excessively, resulting in excessive lactic acid in the surrounding muscles and tendons, which leads to the symptoms of self-beating, mainly because this lactic acid inflammatory substance stimulates the muscles, resulting in muscle tension and spastic contraction, which is also accompanied by The symptoms are relieved after rest. The second aspect is damage or inflammation of the soft tissues around the knee joint, not only due to local cold stimulation caused by strain, but also due to chronic inflammation of the local soft tissues, which stimulates the soft tissues around the knee joint to produce their own throbbing in addition to the muscles, and other symptoms generally appear. Any other symptoms should be examined and diagnosed in a timely manner.