Endometriosis, it's one of the most common gynecological diseases, in fact in the US, 5.5 million women suffer from it.

"The truth is that nobody really knows or understands what causes it," said Dr. Naomi Bloomfield

Endometriosis can affect any woman, but if you haven't had a baby you more at risk. While the cause is questionable, one theory has to do with the menstrual cycle.

"The tissue that sloughs off once a month, inside the uterus backwashes through the tube during menstruation and the tubes are open to the abdominal cavity, then you get little implants of the endometrium which is the lining of the uterus, that implant themselves in the abdominal cavity," said the doctor.

The pain, mainly cramping is felt when the implants begin to slough off, often felt in the week prior to and the first day, of the menstrual cycle.

How do yo know you have endometriosis, symptoms aren't that apparent, you may need an ultrasound, MRI or surgery called a laproscopy.

"There are women who need surgery. There are various medications you can take such as Lupron, you can get a shot once a month for six months. It can make you pain free for several years sometimes," Bloomfield said.

Symptoms do range and the severity of the disease doesn't always mean more pain.

"There are many women who have very few endometriotic implants who have horrendous pain There are other women who are full of endometrious, when you open their belly and they are full of these blood filled cysts and they don't have a pain or care in the world," said Bloomfield.

Endometriosis can interfere with pregnancy either due to scar tissue blocking the fallopian tube or, "There are other chemicals that perhaps get secreted with women who get endometriosis that interfere with the ability to get pregnant," the doctor said.