Reddish-brown urine after exercise may be concentrated urine, which is a normal physiological phenomenon. It may also be caused by urinary stones, myoglobinuria and other reasons. 1. Concentration of urine: because the human body sweats a lot during exercise, it will lead to the concentration of urine, the symptoms of reddish-brown urine after exercise, which is a normal physiological phenomenon, generally do not need special treatment. 2. urinary system stones: urinary system stones is the kidney, bladder, ureter, urethra and all the stones of the general term, usually metabolic abnormalities, urinary tract obstruction, low water intake and other reasons for the disease is generally manifested as urinary pain, urinary urgency, hematuria, etc., so the patient will be reddish-brown urine after exercise symptoms. 3. Myoglobinuria: reddish-brown urine after exercise may be myoglobinuria, muscle ischemia caused by muscle decomposition during strenuous exercise, myoglobin excreted through the kidneys but in the urine, so that the urine is reddish-brown. Patients who have the symptom of reddish-brown urine after exercise should go to the hospital in time to avoid delaying the condition and causing adverse consequences.