Pain, the most common symptom of endometriosis, can be the result of:
Implants causing inflammation, which stimulates nerves and creates a sensitive pain response in the pelvis, often constant around the time of a woman’s menstrual period and increasing during intercourse
Scarring between the pelvic organs and tissues
Heavy vaginal bleeding, which increases inflammation and irritation around the pelvic organs
In addition to abdominal pain, inflammation in the pelvis may also cause pain in the lower back or pain during sexual intercourse.