Ejaculated sperm that is yellow may be caused by semen concentration, prostatitis and seminal vesiculitis, urethritis and other factors. 1. Semen concentration: men who have not had sex for a long time and have not had any seminal emission, and there is too much semen in the scrotum, may lead to semen concentration, which will make the semen yellow, and it belongs to the normal clinical manifestation. 2. Prostatitis and seminal vesiculitis: may be related to unclean sex or poor hygiene, can lead to prostate or seminal vesicle infection, inflammatory substances mixed with semen, will lead to yellow semen, serious cases will also appear hematospermia, may also be accompanied by ejaculatory pain, perineal distension, urinary frequency and other symptoms. 3. Urethritis: The presence of unclean sex in men may induce gonococcal urethritis, which can lead to the presence of yellow purulent secretions in the urethra. When ejaculation occurs, the semen mixes with these substances, which will make the sperm yellow, and may be accompanied by burning sensation in the urethra, frequency of urination, urgency, and pain in urination. The ejaculated sperm is yellow, should promptly consult the doctor, improve the examination, clarify the cause and diagnosis, standardized treatment under the guidance of the physician.