Sorry Erikn, I guess I was reading Erika. My son had a hernia repair when he was very young and I will try to recall what was said, but look up more recent information. If there is pain and tenderness it could be what is called strangulation. I'll just go get my medical book -
From World Book - Abdominal pain, pain over the hernia, and vomiting indicate a condition known as strangulation. The blood supply withing the strangulated hernia is cut off and the herniated tissue dies unless an operation is performed. A femoral hernia on the inside of the upper thigh is most likely to become strangulated because the hole is small and the ligament above the femoral artery is strong and tight.
Call your Doctor and tell him - you may need emergency surgery.
My son's hernia was called a bilateral inguinal hernia, both sides of his lower abdomen had not closed before birth. The umbilical hernia cleared itself up.
What kind of hernia do you have? How long have you had it? Has there ever been any pain before?