The red blood cells and white blood cells inside the semen may be the cause of seminal vesiculitis, prostatitis, urethritis and so on. 1. Spermatozoa: Spermatozoa belongs to the male reproductive glands, and the fluid it secretes enters the ejaculatory ducts composed of the excretory ducts and the jugular end of the vas deferens, and becomes a part of the semen. When the inflammatory lesions of the spermatozoa are detected, the permeability of local capillaries increases, and the red blood cells and leukocytes seep out and enter into the semen. 2. prostatitis: the prostate is the largest male reproductive accessory gland, its secretion of prostate fluid is the most important component of the semen, rich in protein hydrolysis enzyme, has the role of liquefaction semen. 3. Urethritis: After the sperm is formed in the testicles, it is discharged through the vas deferens, mixed with prostate fluid, seminal vesicle fluid and other components to form semen, and then through the ejaculatory ducts, the urethra and ultimately ejected from the body. Inflammatory lesions of the urethra, semen is mixed with red blood cells and white blood cells leaked out of the urethra due to inflammation when it is ejected through the urethra. Red blood cells and white blood cells in the semen may also be caused by other factors, it is recommended that patients go to the regular hospital in time for treatment, and strive for early recovery.