In brief: Contusions and minor lacerations, the most common renal injuries, require conservative treatment, and the athlete must refrain from strenuous activities for 2 to 3 weeks. Most patients with hematuria have a renal contusion at most and do not need contrast studies. Underlying renal abnormalities, pyelonephritis, and stone disease are occasionally seen. Patients who have gross hematuria after strenuous jogging or marathons should not run with an empty bladder. The smoke- or tea-colored urine that occurs after athletic endeavors usually resolves without sequelae within 24 hours and requires no further evaluation.