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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.
Hernias can become strangulated when blood flow is cut off to the intestines bulging through your abdominal muscles. This is a serious condition that may cause nausea or vomiting, and may cause difficulty with bowel movements. These symptoms are not caused by a pulled muscle.ain caused by abdominal muscle strains decreases with time as your injured muscle heals. Depending on the extent of damage caused by a pulled muscle, your pain may subside in a few days, or may last as long as several months.