Rib pain after exercise may be caused by strenuous exercise, costochondritis and excessive respiratory muscle activity. 1. Strenuous exercise: if the patient does not do preparatory activities before exercise or overload exercise, it can lead to excessive muscle contraction and excessive accumulation of lactic acid, which will lead to the phenomenon of rib pain after exercise. 2. Costochondritis: if the patient has costochondritis in the ribs, pain may appear under the stimulation of inflammation, which may aggravate the symptoms of rib pain after exercise, accompanied by redness, swelling, elevated body temperature and other symptoms. 3. Excessive respiratory muscle activity: due to the excessive respiratory muscle activity caused by strenuous exercise, resulting in the pleura is stretched, it is easy to cause the phenomenon of rib pain after exercise. When the phenomenon of rib pain after exercise, patients need to go to the regular hospital in time for examination, and according to the results of the examination for treatment.