We hope you'll never need to know this—but in case symptoms of a hernia ever creep up, a Cleveland Clinic surgeon reveals when to act.

In umbilical endometriosis, endometrial tissue can grow inside the belly button (umbilicus). This rare condition is estimated to occur in about 1% of endometriosis cases. There are two types: With ...

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Medically reviewed by Casey Gallagher, MD If your belly button smells, it's likely a sign of poor hygiene or an infection.