An infected belly button piercing will be swollen and may even cause a fever — here's how to care for your new piercing to avoid infection.

Scientists have discovered a hidden fibrous sheath beneath the belly button that explains why navels stay concave for life.

The belly button, it turns out, is one of the least-studied parts of the human body. But one of its great mysteries may now have been solved – why most people have an innie, or concave belly button.