If a man’s urethra suddenly bleeds, he needs to go to the hospital for an examination to clarify the possible causes: 1. Acute urethritis can cause congestion and erosion of the urethral mucosa, resulting in blood oozing from the urethral opening, usually accompanied by pain in the urethra, urinary urgency, urinary frequency and other symptoms. 2. Urethral stones, the stones stay in the urethra causing rupture of the urethral mucosa, which can cause sudden bleeding from the urethral opening. 3. This is usually accompanied by a feeling of obstruction or dyspareunia, bifurcation of urination or persistent pain in the urethra. 3, male prostatic hyperplasia, when the glandular hyperplasia causes rupture and bleeding of the surface vascular varicose, it can result in hematuria, or blood dripping from the urethra, usually accompanied by symptoms of progressive difficulty in urination. 4, urethral tumors or bladder tumors can cause bleeding from the urethra. It can also be accompanied by bleeding during urination. Tumors of the urethra can also cause blockage of the urethra, resulting in pain in the urethra, dyspareunia or difficulty in urination.