Endometriosis and abnormal bleeding — the center for endometriosis care endometrial biopsy pain

It would take volumes to explain all the possible causes for this condition, and I have only this article. So, I will review the basic elements of normal bleeding, then categorize some of the causes of abnormal bleeding. Finally, we’ll look at examples of when abnormal bleeding can be related to endometriosis and when it is not.

• An ovary that can respond to stimulation coming from the brain (via the hypothalamus and pituitary glands) by producing estrogen and progesterone in properly sequenced rhythms. Ovulation occurs when an ovum (egg) matures within the ovary. When you ovulate, the egg is released. Then the active remnant in the ovary (the corpus luteum) produces progesterone.

• The uterine lining (the endometrium) must be able to respond with normal growth to the ovary’s secretion of estrogen and progesterone.


The cervix and vagina must be such that the uterine lining has an open pathway out of the body. When the canal is blocked (by, for example, a polyp), then the narrowness of the canal can create abnormal bleeding.

• The uterus must be able to contract, to prevent the blood coming into the uterus from the uterine, cervical, and ovarian arteries from passing directly to the outside of the body. The uterine walls are thick and their muscular contraction helps control the vessels passing through them.

We have seen that there are three basic components to having a period: your brain, your ovary, and your uterus all have to work correctly with each other. To discuss what can happen when they don’t, I’ve grouped instances of abnormal bleeding into those caused when the brain doesn’t work right, those caused when the ovary doesn’t work right, and those caused when the uterus doesn’t work right.

Endometriosis does not itself cause the uterus to bleed abnormally. More specifically, it does not cause the brain, ovary, or uterus to malfunction. However, it does create problems, which can, in turn, affect any of those areas. Therefore, when a woman with endometriosis has abnormal bleeding, we have to look for indirect effects of the endo and for several other possible reasons for it.

• Ovarian endometriomas (chocolate cysts) can get large enough to put so much pressure on the rest of the ovary that it is not able to respond to stimulation, or is not able to complete the ovulation process. This then leads to abnormal hormone production and possible bleeding abnormalities.

• Ovaries can become encased by adhesions due to endometriosis. The endo irritates the tissues it’s on, and the adhesion forms as your body attempts to wall off the offending area. When the ovary is entrapped this way, cysts can form and abnormal hormone production can result.

• Many of the medical treatments for endometriosis have as their purpose the modification of your hormones. The response to these drugs is quite variable. Abnormal bleeding is very common with Depo-provera. Lupron, Synarel and Danocrine can all cause abnormal bleeding by interfering with normal ovarian hormone production.

• Many patients on drug therapy do not get the expected amounts of hormone administration due to malabsorption of the drug from their gastrointestinal tract. Pain, stress, and other medications (especially pain meds, laxatives, and anti-depressants) can affect how well or poorly the drug is absorbed. The entire drug must be properly absorbed for the blood levels to reach the desired state. Poor absorption thus creates inconsistent responses to the therapy.

The end result is that many women with endometriosis do have abnormal bleeding. The doctor must evaluate each patient individually to look for the influence of endometriosis on the above-mentioned factors, and also bleeding that has causes totally independent of the endometriosis.

It is important to realize that women who have excision often have an interval of abnormal bleeding afterwards. This may be because the manipulator used inside the uterine cavity to move it during surgery can irritate the endometrium. If the ovaries also required surgery, the return to normal function can take 2-3 months. This can also cause an interval of abnormal bleeding post-op.

Finally, I would like to mention one more situation that is potentially of great concern (though thankfully very uncommon). Sometimes, when both ovaries are riddled with endometriosis, we must remove substantial amounts of them. We do not remove healthy tissue, only that which is already lost to disease. In more than 800 patients, we not have three women who had premature menopause post-op. This might have occurred anyway because of the destruction of the ovarian tissue by extensive endo; we just don’t know.

Women are born with such a vast reserve of ova (eggs) that only a small amount of ovary can produce the required hormones and even generate a pregnancy. You don’t need a lot of ovary, but the ovary you have must be healthy. In the huge majority of cases, even with significant surgery on the ovaries, the age at which a woman reaches menopause remains within normal limits.