March is National Endometriosis Awareness Month. Endometriosis occurs when tissue similar to the lining of a uterus grows in other parts of the body. This is a painful condition that can be excruciating during menstrual cycles. Endometriosis is commonly found behind the uterus, ovaries, and fallopian tubes, and sometimes in other organs, such as the bladder, lungs, or intestines. It affects 1 in 10 females worldwide.