 [ Symptoms ] what does it mean if i have blood in my semen [ Disease ] blood in the semen is almost always nothing at all it is a symptom of a small blood vessel probably breaking often during sex sometimes when men are bearing down with heavy lifting or straining sometimes with a difficult bowel movement if they are constipated sometimes for no reason at all so bright red blood in the semen speckled pink brown that happens and unless it is serious meaning it is heavy and prolonged we just ignore it it is is not something to be worried about it is very scary especially if you do not know what to expect and suddenly you see blood in the semen then you panic but it is rarely a problem now if you are an older guy it could be a sign of prostate cancer or a kind of bladder cancer but i have only seen that once in 20 years it is almost always nothing in fact some of the major textbooks do not even address the matter of seminal blood