Endometriosis is defined as endometrial tissue that grows in places outside the uterus. It could be around the ovaries, uterus, bowel or lining of the pelvic cavity. So far, no one has proven conclusively the cause of endometriosis, but there are three main theories.

1. Backward menstruation

2. Weakened Immune System

3. Heredity

You can also check out online sources to find out about coping techniques for endometriosis.

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Menstruation retreat

The menstrual retreat is also known as retrograde menstruation. This is where the lining is shed during that period, and then some of the menstrual fluid flows backward into the fallopian tubes instead of normally come out. Fallopian tubes allow the menstrual fluid dripping into the pelvic cavity so that menstrual fluid sticks to whatever it comes in contact with and begin to grow.

Weakened Immune System

While it has been noted that 4-10 percent of menstruating women develop endometriosis, it has been observed that backward menstruation occurs in almost all women. Because not all women get endometriosis, weakened immune system theory states that because the immune system of some women, may be more susceptible to endometriosis, while those with a more powerful immune to control or eliminate the growth of endometrial tissue outside the uterus.

The Hereditary Factor

It has been observed that endometriosis seems to run in families, suggesting a genetic relationship. The theory goes that some families may have risk factors for offspring that allow abnormal cells to grow in the pelvic cavity.