Anal pain after ejaculation may be triggered by local inflammation, mixed hemorrhoids, perianal genital herpes and other factors. 1. Inflammation: there may be localized infectious inflammation, men may ejaculate due to excessive local exertion, resulting in inflammatory stimulation, which causes pain in the anus. 2. Mixed hemorrhoids: mixed hemorrhoids are mainly varicose vein clusters, usually in the abdominal pressure increases or constipation, will lead to pathological hypertrophy of the anal cushion, the occurrence of downward migration out of the anus and the formation of hemorrhoids, sexual life will accelerate the local blood circulation, which may lead to ejaculation after the anus has obvious pain. 3. Perianal genital herpes: it may be triggered by unclean sex. Typical symptoms are localized blisters and severe pain, especially during ejaculation. In summary, if the phenomenon of anal pain after ejaculation occurs, it is also necessary to go to the hospital for examination and treatment for the cause.