Is there anything that can cause heavy bleeding, during and after, while urinating, in men?

Infection, stone,ect: Infection of the bladder or prostate could cause bleeding however it not typical to have heavy bleeding with these. Urinary stone are associated with bleeding. Cancer of the bladder or urinary system is also a possibility but rare at your age. Finally certain bleeding abnormalities are associated with this symtom. Are you having bleeding problems in other areas?

Not sure, but...: It is not normal for a man or a woman to have blood in the urine. He should consult an urologist and have a full workup to determine the cause of his blood in the urine (also known as hematuria). This typically consists of a ct scan of his abdomen and pelvis, as well as a simple office-based procedure called cystoscopy where the urologist will look inside the bladder with a small telescope.