The arm will be sore when blowing the fan may be due to the fan blowing too long, the surrounding environment temperature is too low and other physiological reasons, may also be due to autoimmune diseases, degenerative joints and other pathological factors. 1. Physiological reasons: arm subcutaneous superficial fascia, deep fascia, subcutaneous blood vessels, muscles and other soft tissue structures attached, if blowing a fan for too long, on the one hand, may cause subcutaneous blood vessel contraction; on the other hand, may also cause muscle, fascia spasm, both may cause the arm after blowing a fan soreness symptoms. In addition, if the surrounding temperature is too low when blowing a fan, the above symptoms may also occur. 2. Pathological factors: patients with autoimmune diseases may accumulate in the joint area of the arm, resulting in the deposition of immune complexes in the joints causing a perverse reaction, after blowing the fan due to local vasoconstriction, inducing the symptoms of arm pain and soreness, such as rheumatism, gout and so on. Degenerative diseases of the joints can cause degeneration of articular cartilage and the formation of bony cumbersome in the joints, and the above symptoms may also appear after blowing a fan. If the symptoms of arm pain are not relieved after blowing a fan, or accompanied by other symptoms, the patient should go to the hospital in time, to clarify the cause and give targeted treatment.