After running, you should temporarily stop running and have a rest. The pain caused by running fork gas is acute chest rib pain during exercise. Acute chest rib pain during exercise refers to the pain in the chest rib during exercise, especially during running, which mostly occurs in the lower rib and will naturally disappear after the exercise stops. Its essence is the spasm of respiratory muscles, especially intercostal muscles and diaphragm. The principle is that muscles enter a state of tension during strenuous activities, but the lungs can't increase tidal volume as quickly as muscles to meet the nutrients and nutrients needed for muscle activities, so muscles are excited under the action of sympathetic nerves. If you are nervous, twitching or your body needs oxygen, you can't breathe normally. Speed up the frequency of breathing, shallow breathing can also cause tension of respiratory muscles, leading to convulsions. Due to respiratory muscle spasm, it will further lead to respiratory disharmony and decreased lung ventilation function, which is not enough to maintain exercise. People's instinct is to stop activities and get rid of it after rest. There is no injury except pain, and with the continuous activity, the body warms up, the muscle spasm is relieved, and the fork gas will gradually improve, but we should be alert to the possibility of pneumothorax. Therefore, for patients who run out of breath, they should stop exercising in time and take a break. If they breathe a sigh of relief after the break, the problem will not be serious. If it still hurts, go to the hospital in time.