what causes an upper abdominal hernia
An abdominal hernia is a bulge or swelling. It happens when some of the contents inside your abdomen (tummy), such as fat or bowel, push through a weakness in your abdominal wall muscle. The abdominal wall is a sheet of tough muscles and tendons that run between your ribs and your groin (upper part of your leg).n abdominal hernia is a bulge or swelling. It happens when some of the contents inside your abdomen (tummy), such as fat or bowel, push through a weakness in your abdominal wall muscle. The abdominal wall is a sheet of tough muscles and tendons that run between your ribs and your groin (upper part of your leg).