You might know that Halsey is an A-list celebrity whose hit "Closer" with The Chainsmokers is one of the longest-running singles to remain No.1 on Billboard's Hot 100. What you might not know, however, is she also suffers from endometriosis, a disorder in which tissue that normally lines the inside of your uterus grows outside of it.
Endometriosis can cause severe pain, especially during a woman's period, when the displaced tissue has no way of exiting the body. Other common symptoms include abnormally heavy menstrual flow and pain during sex, as well as higher risks for ovarian cancer and infertility.