Shoulder pain from turning on the air conditioner may be caused by decreased circulating blood volume, arthritis, muscle injury and other reasons. Different treatment methods should be chosen according to different causes, such as general treatment and physical therapy. 1. Decreased circulating blood volume: blowing air-conditioning causes the shoulder to be exposed to cold, which leads to the contraction of blood vessels in the shoulder, reduced blood flow, and decreased secretion of synovial fluid in the shoulder joint, resulting in increased friction resistance when the joints are in motion, causing pain. Attention should be paid to reduce the cold at the joints and reduce strenuous exercise. 2. Arthritis: blowing the air-conditioning temperature is lowered, the blood circulation in the joints is slowed down, and the inflammatory factors produced by some cells in the shoulder joints due to the reduction of circulating blood volume are stagnant in the local area, stimulating the nerves here to produce pain. At this time, we should strengthen the warmth of the joints, to avoid the joints directly by the wind, but also available items to cover, to avoid the wind. 3. Muscle injury: Muscle contraction is aggravated by cold, which reduces blood flow and leads to accumulation of inflammatory factors and stimulation of peripheral nerves to produce pain. To pay attention to timely rest after exercise, shoulder joint injury, pay attention to muscle protection, at the same time you can massage the shoulder joint every day, promote blood circulation, muscle recovery. Blowing air conditioning caused shoulder joint pain may also be caused by synovitis, ligament damage and other factors. Shoulder pain symptoms have not been relieved for a period of time, it is recommended that patients go to the hospital in a timely manner to seek medical attention and follow the doctor’s instructions for standardized treatment.