Back pain after blowing air conditioning may be due to muscle strain, trauma, cervical spondylosis and myofibrositis. 1. Muscle strain: patients engaged in long-term physical labor will lead to shoulder and back muscle strain, the formation of aseptic inflammation, thus causing back pain. After blowing the air conditioner, the pain will be aggravated due to poor blood circulation caused by cold skin. 2. Trauma: When the back is squeezed or bumped, it will cause localized edema, pain and pressure. If the temperature is low when blowing the air conditioner, it will cause muscle spasm and aggravate the pain symptoms. 3. Cervical spondylosis: patients with cervical spondylosis can also cause back pain after blowing air conditioning. This is mainly due to cause poor blood circulation so that the nerve compression aggravated, resulting in pain radiating to the back pain. 4. Myofibrositis: the back, neck muscle rich, in the cold, exertion and other factors, can appear muscle aseptic inflammation, resulting in the occurrence of pain. The patient’s pain is more limited, percussion pain is obvious, and the pain will be aggravated when the activity. Blowing the air conditioning back pain may also be due to fasciitis and other diseases, patients should consult a doctor in time to check, for the cause of the treatment.