Medically reviewed by Cordelia Nwankwo, MD Key Takeaways Umbilical endometriosis, when tissue grows inside the belly button, causes pain and may require surgery.You should see a doctor if you notice a ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. As I woke, I rolled onto my back, not quite ready to get up for the day ...