What Are the Common Causes of Mucus in Semen?

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  • Written By: Erin J. Hill
  • Edited By: Bronwyn Harris
  • Last Modified Date: 01 October 2019
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Most cases of mucus in semen are totally normal, as there is naturally a certain amount of mucus present in healthy seminal fluids. Men should not normally be concerned if a small amount of mucus is detected upon ejaculation. The main issues with mucus in semen are when the substance is yellow, green, or bloody in color. This could indicate an underlying infection or illness.

Semen is a sticky substance that is comprised of various proteins, sugars, and other biological materials. It is released from the male penis during ejaculation, and it also contains millions of spermatozoa. The semen acts to nurture and nourish sperm cells as they make their way through the female reproductive tract toward the fallopian tubes for the purpose of egg fertilization. In many cases, mucus in semen will be detected. This is normal and acts to help protect and mobilize sperm cells.

Cases where mucus in semen would be a problem involve semen that is an unusual color. While pale yellow semen can sometimes be considered normal, any other variation outside of a normal white shade should be cause for alarm. This is especially true if additional symptoms are present, since this could be an indicator of disease. Sexually transmitted infections are frequent causes for unusually colored semen. Burning, itching, oozing, and blisters are also common with many sexually transmitted diseases.


Yellow semen can be considered normal, or it may mean that urine has leaked into the semen prior or during ejaculation. If there are no other symptoms present and the yellow color is pale, there may be no problem. Yellow mucus in semen could also be pus, which is a sign of serious infection. Males with yellow semen should seek medical care immediately.

Dark green or blood-tinged semen are also signs of infection. The tip of the urethra can become irritated and inflamed with many sexually transmitted diseases, and bleeding may occur during urination or ejaculation. If these or any other symptoms become noticeable, men should be tested for common sexually transmitted infections. Less common health conditions may also cause similar symptoms, although they will typically be accompanied by other symptoms.

Aside from color, there are other ways to determine semen health. Seminal fluids should not have a strong odor, nor should they be watery in nature. Normal semen is thick when it is released and then becomes more watery over time. It is also usually white in color, although more transparent can also be normal. Any variation from a man's usual semen may be cause for concern, even if no other symptoms are present at the time.


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Post 4

@ddljohn: Then your partner might have been with someone else, if it s an STD, that is! Hope not.

Post 3

@ddljohn-- I'm not entirely sure about this but I think that STDs usually cause green semen, rather than yellow. I might be wrong though.

I do know that green mucus in semen is a sign of gonorrhea.

Post 2

@ddljohn-- You can't know for sure what is causing the yellow mucus in your semen until you see a doctor. They need to take a sample and send it to the lab to test for infections.

It sounds like a case of prostatitis to me though. I had prostatitis with the same symptoms that you have now. In my case, the yellow mucus was urine leaking into the prostate and changing the color of my semen. The urine also caused an infection and that's what causes urination problems. See a doctor right away to get treated.

They will probably do an STD test just to be on the safe side. But STDs are not the only cause of this condition, so don't jump to conclusions.

Post 1

I have had yellow semen for the past few weeks now. I don't have pain while urinating but there is something wrong with the flow of urine. It starts and stops without me trying. What do these symptoms point to?

I hope that it's not an STD. I'm not sure how that could be because I have only been with the same partner for the past five years.

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