A sarcoma growing in the urethra may be caused by warts, urethral cysts and urethral caruncle. 1. Condyloma acuminatum: caused by human papilloma virus infection, the infection usually grows in the urethra, perineum and other nearby, there will be pimples, plaques, papillae or cauliflower-like superfluous organisms. 2. Urethral cysts: most often seen at the urethral opening translucent, raised cystic changes, which contains liquid tissue, thin outer wall, soft texture, no pain. The size of the volume can grow slowly over time, and when the volume is large, it can affect urination. 3. Urethral caruncle: caused by a decrease in estrogen levels in the body, usually grows in the lower part of the urethral orifice, there is no pain when urinating, but there may be urination effort, wipe will have blood, often in middle-aged and elderly women. When the patient has a sarcoma growing in the urethra, it is recommended to go to the hospital urology department in time to check and give standardized treatment.