Endometriosis is traditionally defined by the presence of tissue similar to the lining of the uterus, the endometrium growing in locations where it doesn't belong, such as the fallopian tubes, ovaries and pelvic cavity. Since this tissue is hormonally responsive, it bleeds and causes inflammation during a menstrual cycle.While experts have long categorized this as a condition solely affecting women, rare clinical cases have shattered this assumption and revealed that the biological blueprint for endometriosis exists in the male body as well.What Causes Endometriosis?There is no exact cause of endometriosis, but possible causes include:Retrograde menstruation: Fallopian tubes and into the pelvic cavity instead of out of the body. These cells may stick themselves to the inner pelvic lining and organs from where they multiply.Transformed peritoneal cells. Hormones or immune factors might transform cells that line the inner side of the abdomen, called peritoneal cells, into cells that are like those that line the inside of the uterus.Embryonic cell changes. Hormones such as estrogen may transform embryonic cells in the earliest stages of development into endometrial-like cell growths during puberty.Surgical scar complication. Endometrial cells may attach to scar tissue from a cut made during surgery to the stomach area, such as a C-section.Endometrial cell transport. The blood vessels or tissue fluid system may move endometrial cells to other parts of the body.Immune system condition. A problem with the immune system may make the body unable to recognize and destroy endometriosis tissue.What Are Symptoms Of Endometriosis?Severe Abdominal PainBloatingPainful periodsPain with sexPain with bowel movements or urination. Excessive bleedingInfertilityFatigueDiarrheaConstipationNauseaHow Does Endometriosis Develop In Men? When fertilization occurs, both sexes develop Müllerian Ducts. These ducts are paired tubes that grow into female reproductive organs early in fetal development. They help in the formation of the uterus, cervix, fallopian tubes and upper vagina. However, men develop the Anti Mullerian Hormone, also known as AMH which regresses the formation of these ducts.Men can develop the ducts when exposed to estrogen. Typically, those who are undergoing prostate cancer treatment, hormone replacement therapy or suffering from obesity take estrogen. Consistent exposure to estrogen can actually transform those inactive cells or remnants of Mullerian Ducts into endometriosis tissues and pave the way for the development of the disease. How Common Is Endometriosis?A study reveals that nearly 43 million women globally, out of which, nearly 10 percent of Indian women suffer from endometriosis. While the disease is almost diagnosed in women, documented cases in men confirm that they hold the biological potential to develop endometriosis.