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A Honor Society of Nursing (STTI) answered. External hernias are caused by part of an organ pushing through an opening or weakness in the abdomen wall. An internal hernia is caused by part of an organ pushing into an opening or weakness in the wall of another organ within the same cavity.External hernias are also brought about by pressure or strain placed on openings or weak spots on the abdominal wall.n internal hernia is caused by part of an organ pushing into an opening or weakness in the wall of another organ within the same cavity.
Hernia types. There are several different types of hernia : Inguinal hernia is the most common. This occurs when part of your bowel squeezes through your lower abdomen into the groin. Hiatus hernia is when part of your stomach pushes up into the chest through an opening in the diaphragm.or inguinal, femoral, umbilical, and incisional hernias, symptoms could include: 1  An obvious swelling beneath the skin of the abdomen or the groin; it may disappear when you lie down, and may be tender. 2  A heavy feeling in the abdomen that is sometimes accompanied by constipation or blood in the stool.