Surgery and its Risk.

According to the National Institutes of Health (NIH), wound problems
and complications from blood clots are common aftereffects of
gastric bypass and gastroplasty surgery. The NIH has also reported that
those undergoing surgical treatment for obesity have had substantial
nutritional and metabolic complications, gastritis, esophagitis, outlet
stenosis, and abdominal hernias. More than 10 percent required another
operation to fix problems resulting from the first surgery.