Possible reasons for the appearance of blood-colored urine: 1, drugs or food staining, such as consuming too much red pigmented food or using special drugs, such as Difampicin capsules, cyclophosphamide injection, etc., will appear in the urine color red. If the color of urine returns to normal after stopping the drug or food, it is suggested that it is caused by the use of the drug or food.2. Bleeding in urine, there are many reasons for bleeding. Infection of the urinary system can lead to mucosal congestion, bleeding and lead to reddish urine color, accompanied by urinary tract irritation symptoms such as frequent urination, urinary urgency, urinary pain. If there are stones in the urinary system, such as kidney stones, ureteral stones, etc. can also appear in the urine color of blood, accompanied by pain in the lower back and abdomen. Routine urine examination and ultrasound examination of the urinary system are needed to exclude whether there are infections and stones.3, when the urinary system is damaged, it can also cause blood in urine, such as the impact of the waist, blow, fall from a height, perineal area by riding or impact, etc., which leads to blood in the urine due to the damage of the mucous membrane epithelium of the urinary system.4, there are tumors in the urinary system, such as renal tumors, ureteral tumors, bladder tumors, etc., all of which will appear after tumor necrosis, and will be treated with the same treatment. If there are tumors in the urinary system, such as kidney tumor, ureter tumor, bladder tumor, etc., the necrosis of the tumor will destroy the mucous membrane and lead to bleeding, and the urine will be bloody. Further CT examination of urinary system is needed to confirm or exclude.