Involuntary discharge of semen in men is considered to be related to prolonged absence of sexual life, prostatitis, seminal vesiculitis, and so on. 1. No sex for a long time: For some men who have not had sex for a long time, when the amount of semen exceeds the storage limit of the epididymis and seminal vesicles, there may be an involuntary discharge of semen after slight stimulation. This is usually a normal phenomenon and men do not need to worry too much. 2. Prostatitis: patients will experience high fever, frequent urination, urinary urgency, painful urination, suprapubic pain, urine dribbling and other symptoms. The disease can also cause some male sexual dysfunction, such as premature ejaculation, spermatorrhea, ejaculatory pain, etc. Spermatorrhea can be manifested as involuntary semen flow. 3. Vesiculitis: Vesiculitis can also cause involuntary discharge of semen in some men, but also easy to be accompanied by bloody semen, ejaculation pain, burning sensation in the urethra, painful urination, urinary urgency, weakness and other uncomfortable symptoms. It is recommended that men who have involuntary semen discharge should seek medical examination and follow the doctor’s instructions after clarifying the disease, and should not use drugs indiscriminately.