What causes Endometriosis?

Possible causes include:

• Menstrual tissue backs up through the fallopian tubes and spills into the abdomen
• Immune system may allow the tissue to implant and develop into endometriosis
• Lymph system may carry endometrial cells from the uterus
• Certain cells on abdominal organs turn into endometrial tissue

Hormones and growth factors cause the disease to progress.