Blood after urethral dilatation is usually normal if the bleeding is small. If the bleeding is heavy it may be abnormal and should be seen by a doctor. Urethral dilatation is usually used to treat severe urethral strictures or inflammatory adhesions. Because urethral dilatation uses a urethral probe, when the urethral probe passes through the narrowed section of the urethra, the local mucous membrane is torn or damaged, and the mucous membrane of the urethra exudes blood, causing the urethral opening to drip fresh blood. Usually the amount of bleeding is not much, and most of it can be gradually disappeared soon, which is usually normal. It is usually normal to drink plenty of water and urinate more often. If the amount of bleeding is relatively large, this situation is not normal, local pressure to stop bleeding, indwelling catheter to keep the urethra open, to promote blood discharge. Urethral dilatation with blood, it is recommended to see a physician, follow the doctor’s instructions.