A man feels pain when he ejaculates may be due to physiological factors such as excessive masturbation, frequent sexual intercourse, or considered to be due to seminal vesiculitis, urethritis and other diseases. 1. Physiological factors: excessive masturbation and frequent sexual intercourse may cause the genitals to be in a state of repeated and sustained congestion, which can lead to pain when a man ejaculates. This kind of situation is a normal phenomenon, men can properly regulate the number of masturbation and sexual intercourse, can relieve the symptoms. 2. Vesiculitis: Vesiculitis may be caused by pathogen infection, alcoholism, excessive sex, perineal injury and other factors. Inflammatory stimulation of the patient may appear ejaculatory pain, painful urination, bloody semen and other symptoms, can be manifested in the ejaculation of the feeling of pain. 3. Urethritis: Urethritis is a chronic, acute inflammation of the urethra caused by non-gonococcal, gonococcal pathogens. Symptoms are painful urination, painful ejaculation, painful intercourse, cloudy urine, hematuria, etc. Patients may experience pain when ejaculating. There are many reasons that lead to feeling pain when ejaculating, it is recommended that patients go to regular hospitals, relevant examinations, clear causes under the guidance of the doctor’s treatment.