The yellowish semen refers to the yellowing of semen, which may be a physiological phenomenon, or it may be caused by external stimulation, or by diseases such as seminal vesiculitis and prostatitis. 1. physiological phenomenon: for example, a long time without sex, semen long-term storage in the seminal vesicles, may cause the appearance of semen yellow phenomenon. 2. external stimulation: abdominal trauma, such as impact, extrusion, or excessive masturbation frequent sex, may cause congestion, swelling, capillary rupture of the genitourinary system, manifested in the symptoms of yellow semen. 3. seminal vesiculitis, prostatitis: seminal vesiculitis, prostatitis, orchitis, epididymitis and other urological diseases, may also appear semen yellow appearance. The reason for the yellowing of semen is that there may be other reasons why you need to go to the hospital in time to get checked out and get a clear picture of the cause of the problem and follow the doctor’s instructions.