Can an STD cause blood in a male's urine?

There are six known causes:

Prostatitis

This is caused by inflammation of the prostrate gland. It would be painful and be accompanied by these other symptoms - pain when urinating, pain when ejaculating, difficulty urinating and discomfort around the pelvis, bottom, lower genitals and lower back.

It is caused mostly by a bacteria infection, which can be treated by a doctor by antibiotics.

Epididymitis

This is caused by a bacterial inflammation. The main and most common bacteria causing this is E. Coli. This bacteria can come from two things- A) The urinary tract back-flowing into the reproductive tract. B) Not cleaning the penis properly after anal sex (The anus is the perfect breeding ground for E.Coli bacteria).

It can also be caused by the chlamydia and gonorrhoea sexually transmitted diseases.

As for treatment you'll have to see a doctor, because it depends which is causing the issue for the patient.

Hemophilia

A genetic condition which prevents blood from clotting properly. It is rare to find this condition affecting semen. Hemophilia can be treated with blood clotting drugs, but is usually noticed in childhood.

Trauma

A kick, punch or massive force applied to the genital area can case internal bleeding, which will leak into the urine. Men who prefer to be dominated during sex can easily develop internal bleeding from the rough acts. The internal bleeding should be investigated by a doctor immediately. It is very difficult for the body to heal internal bleeds by itself.

Cancer

Prostrate or testes cancer can cause a bleed, which can leak into urine. Get checked right away. The faster you get checked, the better, because cancer, if that is the cause, spreads every day,

Sexually Transmitted Disease

If left untreated for a long period, chlamydia and gonorrhoea will eventually cause blood to be leaked into the genitals and therefore the urine.

Herpes can cause internal ulcers almost immediately, which can bleed, causing blood to leak into the urine.

Either way, you need to see a doctor as soon as possible. The cause could be minor or it could be major - only way to be sure id to get it seen to.

Avoid having sexual intercourse. Blood is very infectious, many conditions in blood can be passed on to others through contamination. you need to contact everybody you have come into sexual contact with and insist they be checked. Having intercourse while knowingly having a suspected STD is a criminal offence and will result in jail.

Please see a doctor, do not be embarrassed, they deal with these things every day, there isn't a single type of penis they haven't seen.