The exact causes of Endometriosis are unknown, yet certain possible reasons have been put forward:
- Retrograde menstruation: During periods, the endometrium sheds and is passed out of the body through the vagina. But in some cases, pieces of endometrium can 'flow back' into the uterine tubes and get implanted, causing endometriotic patches.
- Embryonic cell growth: Another theory explaining causes of Endometriosis is that endometriotic patches can form in a female baby while it is still in the womb of the mother.
- Genetics: Genetics plays an important role in causes of Endometriosis. The disease is more common in females whose mother or sister have /have had similar condition.
- Imperforate hymen: The hymen is small tissue that partially blocks the vaginal opening. If the hymen completely covers the opening, menstrual blood may accumulate in the uterine cavity. This condition may go undiagnosed for the first few cycles and blood may fill fallopian tube and by retrograde route resulti in endometriosis.
- Surgery: After hysterectomy (surgery to remove uterus) or Caesarean section (surgical delivery of baby), endometrial tissue may get attached to the site where an incision has been made on the skin.
