The possible reasons for ejaculation pain in the lower body in the 50s may be inflammation of the reproductive organs, too frequent sex, urinary tract stones, tumors, etc. It is recommended to seek medical treatment in time. 1. Inflammation of reproductive organs: male lower urinary tract infection is a common factor causing swelling and pain in the lower body after ejaculation, such as cystitis, prostatitis, urethritis, etc., when ejaculation, the muscles of these organs will undergo rhythmic contraction, which will produce a mechanical stimulus to the inflammation site, resulting in pain. 2. urinary stones: if there are small urethral stones embedded in the parts of the opening of the ejaculatory ducts, due to the contraction of these parts during ejaculation, this will lead to the stones being squeezed to produce pain. 3. Tumor: If there is a tumor in the male urogenital organ, there will also be pain in the penis after ejaculation. In the early stage, it is only a slight soreness, and as the tumor becomes bigger, the pain will gradually increase. When ejaculation lower body swelling and pain occurs in the 50s, it is recommended to reduce the frequency of sexual intercourse and seek medical treatment as soon as possible to clarify the cause of the disease and then treat it as early as possible. In daily life, pay attention to the cleanliness and hygiene of the genital area.