Typical pinworm infections don't cause serious problems. In rare circumstances, heavy infestations may cause:

  • Infection of female genitals. In women or girls, the parasite may travel from the anal area up the vagina to the uterus, fallopian tubes and the area around the pelvic organs. This can cause problems such as inflammation of the vagina (vaginitis) and inflammation of the inner lining of the uterus (endometritis).
  • Weight loss. When a large number of adult pinworms are living in your intestines, they can cause abdominal pain and take enough nutrients that you'll lose weight.
Jun. 09, 2012