Yellowing of urine after exercise is generally a normal phenomenon, but yellowing of urine may also have nothing to do with exercise, such as urethritis, hepatitis does not exercise can also lead to yellowing of urine. 1. Normal phenomenon: yellow urine after exercise is generally a normal phenomenon. As the body sweats a lot after exercise, the body of water is reduced, no timely supplementation of water, the volume of urine to reduce the concentration of urine, urine metabolites in the concentration of urine increased so that the urine is yellow, is generally a normal phenomenon, if there are no other uncomfortable symptoms, no special treatment. 2. Urethritis: Urethritis is mainly caused by bacteria, Chlamydia trachomatis and mycoplasma and other pathogens infections caused by a disease, the patient will appear urethral itching and burning pain, yellow urine, odor and other symptoms. 3. Hepatitis: Hepatitis will lead to the rise of bilirubin in the urine and cause yellow urine, yellow-brown, but will not be washed out because of increased water intake. If the patient in the exclusion of exercise and other physiological factors, there are still symptoms of yellow urine, there may be infections, liver disease, etc., should go to the hospital in a timely manner to avoid delays in the condition of the adverse consequences.