Painful ejaculation after drinking beer may be caused by alcohol stimulation, but it is not ruled out due to prostatitis, seminal vesiculitis and other diseases. 1. Alcohol stimulation: Alcohol contains ethanol and other harmful substances, and when eating and drinking too much in a short period of time, it may cause stimulation to the prostate gland, resulting in the phenomenon of pain in ejaculation after drinking beer. 2. Prostatitis: usually due to pathogenic bacterial infection and other factors leading to inflammatory lesions, the patient after drinking alcohol will lead to prostate congestion and edema, thus appearing after drinking beer ejaculation pain phenomenon. 3. Seminal vesiculitis: usually due to staphylococcus, aspergillus and other pathogenic bacterial infections, after drinking alcohol, will lead to local vasodilatation, so that the affected tissues are congested, appearing after drinking beer ejaculation pain phenomenon. Alcohol is harmful to the human body, and it is generally not recommended to drink too much alcohol for a short period of time or for a long period of time. If you have any of the above conditions, it is recommended that you go to the hospital in time to avoid delaying your condition.