If there is no blood in the urine and there is blood when wiping, then it is recommended to go to the hospital for examination to clarify the specific cause. First, the caruncle or polyp of the urethra, which can then appear as a surface breakthrough and bleed. It is clear in the urine, and can be manifested as pain in the urethra. Urethral examination is needed to find out whether there are polyps or caruncles. If polyps or caruncles are present, it is also important to know if there are any erosions or ulcers on the surface of the polyps or caruncles. It is mostly seen in women because the urethral opening is easier to see when men urinate, while it is often difficult for women to see the urethral opening. Second, the urethral warts and other changes, if the occurrence of unclean sexual contact, and lead to the local appearance of warts. Can appear in the urethra, perineum, small sarcoma-like changes, the surface is easy to bleed when touched, when urinating blood did not enter the urine, so the urine color is normal, but can appear bleeding when wiping. Conduct a physical examination, can be seen in the urethral orifice of the papillary or cauliflower-like protrusions, need to be localized excision.