The fact that there is a gelatinous substance in the semen can be caused by normal physiological phenomena, seminal vesiculitis, prostatitis and other diseases. 1. Normal physiological phenomenon: when the semen is discharged through the seminal vesicles, the seminal vesicles can produce coagulant protein, which promotes the protein coagulation in the semen, thus making the semen appear gelatinous and jellied, etc. When the semen is discharged from the body due to the liquefaction of the gelatinous material will soon change to a liquid state. 2. Spermatozoa: when the semen is gelatinous, it can be caused by spermatozoa. Bacterial infection in spermatozoa can lead to inflammation of the spermatozoa, which affects the normal secretion function of the spermatozoa, leading to an increase in the secretion of coagulant proteins, which affects the liquefaction of the semen, resulting in the emergence of gelatinous substances. 3. Prostatitis: The prostate gland can play a role in liquefying semen and secreting protein hydrolysis enzymes. When prostatitis occurs, the amount of protein hydrolysis enzymes secreted by the prostate gland can be reduced due to inflammation and infection, which in turn affects the liquefaction of semen and makes it gelatinous. The above symptoms may also be caused by other factors, semen gelatinous material, should be timely to the regular hospital medical treatment, under the guidance of specialists to actively carry out appropriate treatment, and strive for early recovery.