Causes Of Endometriosis
Endometriosis is an idiopathic disease, which means the cause of the disease is largely unknown. However, there are a few theories that explain the mechanism of endometriosis:
1. Retrograde or Reverse menstruation: This popular theory suggests that during menstruation, some of the blood and tissue containing endometrial cells from the uterus travels through the fallopian tubes into the pelvic cavity. These endometrial cells stick to the walls of the pelvic cavity and continue to proliferate and bleed over the course of each menstrual cycle. Mostly all women have some degree of reverse menstruation, but only a few develop endometriosis. This is thought to be because of differences in a woman’s immune system.
2. Coelomic metaplasia or Cellular metaplasia: According to this theory, cells in the body outside of the uterus transform into endometrial cells that line the uterus.
3. Endometrial cell transport: This theory suggests that endometrial tissue may travel through the blood or lymphatic system to other distant areas or organs.
4. Direct implantation: Endometriosis can also occur because of direct transplantation in the abdominal wall. Eg. During a cesarean section or some pelvic surgery like hysterectomy, some endometriosis tissue might accidently get implanted in the abdominal incision.
5. Genetic factors also play a role as the disease is much more common if your close relative like your mother, sister also has the disease.
The most common sites of endometriosis include:
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The ovaries
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The fallopian tubes
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Tissues that hold the uterus in place
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Outer surface of the uterus
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The lining of the pelvic cavity
Other sites of growth could be the vagina, cervix, vulva, intestines, bladder, or rectum. Very rarely, endometriosis can appear in distant parts like the skin, lungs and brain.
Stages of endometriosis
Endometriosis occurs in 4 stages, depending on the depth and area it affects. These are described as follows:
Stage 1: This is the minimal type of endometriosis, where small lesions are present. These are present on the tissue lining the pelvis or abdomen. There is no scar tissue.
Stage 2: This is the mild type of endometriosis. More lesions are present in deeper tissue, along with some scar tissue.
Stage 3: This is the moderate stage of endometriosis. There are several deep lesions at this stage. Small cysts may also be present in ovaries, along with scar tissue or thick bands known as adhesions.
Stage 4: This is the most severe stage of endometriosis. This type of endometriosis is widespread and is associated with several deep lesions and thick adhesions. Large cysts may also be present in one or both ovaries.