What Is Endometriosis?

Endometriosis occurs when the tissue that lines the inside of the uterus begins to grow in places it shouldn’t, which can cause debilitating pain and infertility. Around 11% of women have endometriosis, although many remain undiagnosed.

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There Are 4 Stages of Endometriosis. Here's What Each One Means

Experts use stages to classify endometriosis by severity, but the stage doesn't always correspond to a woman's pain and discomfort levels.
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