Hernias occur when an internal organ or tissue protrudes through a weakness in the muscle or surrounding wall of the cavity it normally resides in. There are several types of hernias including inguinal, femoral, umbilical, incisional, and others. Risk factors include increased abdominal pressure, obesity, family history, and chronic conditions. Symptoms range from a painless bulge to a painful, swollen protrusion that cannot be pushed back in. Diagnosis involves examination and testing to identify location, contents, and severity. Treatment options depend on severity but typically involve surgical repair to reinforce the weak area, with mesh being commonly used to prevent recurrence.