Endometriosis occurs when tissue that acts a lot like the lining of your uterus—called endometrium—starts growing outside of your uterus, where it doesn't belong.
These out-of-place growths, called lesions or implants, can cause severe pain and inflammation throughout the month.
Symptoms
Women with endometriosis can experience a variety of symptoms, where some can experience none at all. Symptoms can vary, but may reflect the area where endometriosis is located. Some other possible endometriosis symptoms include
Symptoms of endometriosis include: painful bowel movements, painful urination, bleeding or spotting between periods, heavy menstrual bleeding, bloating, fatigue, feeling sick or faint, or vomiting during your period, pain in the lower back, abodmen, or groin, difficulty participating in day-to-day activities because of excessive pain, exhaustion, or weakness