Semen consists of sperm and fluids sent out by the prostate and other glands. The fluids, also called ejaculate, join the sperm as they pass via a series of tubes to the urethra for ejaculation. A number of variable can break blood vessels along this route or along the urinary route to the urethra. Broken vessels then leak blood into the semen, urine or both.
Your doctor will ask to know if you’ve had prostate surgery or a prostate biopsy recently, since these procedures can make blood in semen for several weeks afterward.
In most situations, no cause can be found for blood in semen. In some cases, particularly among men under age 40, infection is a possible cause. Infection is usually accompanied by other symptoms and signs, such as painful urination.
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For men age 40 and older, or if the blood in semen is severe or recurrent, in rare situations this might be a warning sign for conditions such as cancer. As a result, a more-careful evaluation might be required. But the risk is low. In a follow-up study of 200 men, mostly over 40, who typically had multiple episodes of blood in their semen, prostate cancer start in only 4 percent.
Possible causes of blood in semen:
- Chlamydia trachomatis
- Excessive sexual activity or masturbation
- External beam radiation for prostate cancer
- Genital Herpes
- Interrupted sex
- Prolonged sexual abstinence
- Prostate biopsy
- Prostate cancer
- Testicular trauma
Rare causes of blood in semen could include:
- Benign growths (cysts, polyps) in the bladder, urethra or prostate
- Testicular Cancer
- Wafarin side effects