Could masturbation cause urethral bleeding in males?

Seek another cause: If this problem lasts for more than a few days and the patient hasn't been inserting something while he's enjoying himself, look for another cause. It would be a shame to miss a small urethral carcinoma.

Bleeding: Sure, you may be traumatizing the lining of your urethra. Be gentle and don't do it for a few days, let it heal.. If keeps happening, see a urologist.