A hernia is the protrusion of an organ or the fascia of an organ through the wall of the cavity that normally contains it. Lumbar hernias occur through defects in the lumbar muscles or the posterior fascia, below the 12th rib. Patients with lumbar hernias can present with a variety of symptoms, including a back pain, bowel obstruction (if the contents contain bowel), or urinary obstruction (if the contents are kidney / ureter).
An umbilical hernia occurs when part of the intestine protrudes through an opening in the abdominal muscles. Umbilical hernias often develop in infants but may also develop in adults, especially if they are very overweight, lifting heavy objects, or have a persistent cough. Women who have had multiple pregnancies, have a higher risk of developing an umbilical hernia. The hernia looks like a lump in the navel, which may become more evident when laughing, crying, heaving (going to the toilet), or coughing
Original article and pictures take http://www.zcolonhealth.com/16-of-the-most-common-types-of-abdominal-pain/ site