Blood in the urine after walking a lot may be due to exercise resulting in damage to the urethral mucosa, urinary tract infection and urinary stones, tumors and other conditions, further examination is recommended. 1. Damage to the urethral mucosa: If the urethral mucosa is damaged due to strenuous exercise, trauma, etc., there may be more walking or brief bleeding after exercise. 2. Urinary tract infection: If you don’t pay attention to personal hygiene and don’t clean it in time, or if you have had a urethral examination and have urinary retention, etc., it may lead to the emergence of urinary tract infection, and the performance of hematuria after activity may also occur. 3. Urinary stones and tumors: if there are ureteral stones or bladder tumors and other lesions, walking or exercise will lead to friction of the stones against the ureter and extrusion of the tumor, and the symptoms of hematuria may occur. Therefore, further examination is recommended to clarify the cause of the disease and treat the cause.