Medically reviewed by Cordelia Nwankwo, MD Key Takeaways Umbilical endometriosis, when tissue grows inside the belly button, ...

After posing the question, the "Teenage Dream" singer and mom-to-be showed a video on her Instagram Stories featuring an extreme close-up of her baby bump — with a fully distended belly button. That's ...

Medically reviewed by Qin Rao, MD Key Takeaways Belly button pain can come from minor, treatable issues like constipation or indigestion.Crohn's disease and appendicitis are more serious causes of ...