I hear you on that, it can be scary however It is likely that you will immediately think that you have a serious disease, such as cancer. Not so; most of the causes of blood in the semen are not serious. There have been several scientific studies of this problem and they all came to more-or-less the same conclusion, which is that the likelihood of finding a reason for the bleeding depends on your age.In people over the age of 40, a cause can usually be found. It might be infection or a prostate problem, or some other cause. Prostate cancer has to be considered, especially in older people, but is not a common cause of it!
The male reproductive system has a lot of tubing and the source of bleeding could be anywhere in the system. If the blood is red or pink, it most probably comes from the urethra (the tube inside the penis). If it is dark, it may come from further back (such as the prostate or an area called the seminal vesicles). Because one of the most common causes is inflammation in the urethra or prostate gland, sometimes because of an infection, it would be sensible to have a check-up with your doctor!
Don't try to treat the problem with ibuprofen an anti flammority medicine because the problem is already present