Blowing air conditioning joint pain is mainly due to two reasons: 1, the joint has a chronic aseptic inflammatory lesions, such as osteoarthritis of the knee, patellar chondromalacia and meniscus ligaments in the joint, soft tissue degeneration and inflammation, after blowing air conditioning due to the decline in local blood circulation, will lead to inflammatory lesions in the inflammatory metabolites gradually increased, when reached a certain level 2, due to joint parts in maintaining a posture for too long, such as the state of flexion, the ligaments around the joint muscle tissue will be in its continuous stretch and tension, over time there will be strain and excessive fatigue, local lactic acid and metabolic products will gradually increase the accumulation. After blowing on the air conditioner for a long time, the local accumulation will become more and more, which will gradually stimulate the peripheral nerves and cause joint pain.