Summer fan leg soreness is considered to be due to lower limb muscle spasm, osteoporosis, rheumatoid arthritis and other reasons. 1. Lower limb muscle spasm: As the legs are blown directly by the fan for a long time, the leg muscles are cooled, which causes the leg muscles and ligaments to spasm, and then leads to leg pain. 2. Osteoporosis: If the patient himself suffers from osteoporosis, after being blown by the fan for a long time, the situation of catching a cold will aggravate the condition, thus causing the patient to experience the symptoms of leg pain. 3. Rheumatoid arthritis: If the patient suffers from rheumatoid arthritis, involving the joints of the legs, after being attacked by the cold wind, it will also aggravate the patient’s discomfort, and soreness in the legs. Because of the summer fan leg pain caused by more reasons, may also be varicose veins, arterial embolism and bone tumors, etc., when the relevant discomfort should be immediately avoided fan blowing, if the symptoms are not persistent or more serious, it is recommended to go to the hospital in a timely manner to check the diagnosis, as soon as possible to determine the cause of the disease to take targeted therapeutic measures.