Which of the following is NOT a complication associated with gastric bypass surgery?

Gastric bypass surgery, a common procedure for treating obesity, can lead to a variety of complications. Among the options listed, hernia is typically not considered a direct complication associated specifically with gastric bypass. While hernias can occur in patients who have undergone any abdominal surgery due to changes in anatomy or increased abdominal pressure, they are not a unique or common complication linked specifically to the mechanisms of gastric bypass surgery itself.

In contrast, dumping syndrome is a well-documented complication resulting from rapid gastric emptying, which can cause symptoms such as nausea, vomiting, and diarrhea. Gastro-gastric fistula, another specific complication, involves an abnormal connection between the stomach pouch and the remnant stomach, which can lead to various digestive issues. Hypoglycemia occurs in some patients following gastric bypass, usually due to the rapid intake of sugars and carbohydrates that provoke an insulin response, leading to low blood sugar episodes.

Each of the other listed complications is directly related to the changes in digestive physiology brought about by the procedure, while hernia is a broader surgical complication not exclusive to gastric bypass.