| Re: vagus nerve
Have you had the vagus nerve cut at some time in the past? If so, that may be a contributing factor for having diahrrea.
Rapid transit of stool is a cause of diarrhea. For stool to have normal consistency, it needs to remain in the large intestine for a certain amount of time. Stool that leaves the large intestine too quickly is watery. Many medical conditions and treatments can decrease the amount of time that stool stays in the large intestine, including an overactive thyroid (hyperthyroidism) or Zollinger-Ellison syndrome; surgical removal of part of the stomach, small intestine, or large intestine; treatment of ulcers in which the vagus nerve is cut; surgical bypass of part of the intestine; and drugs such as antacids containing magnesium, laxatives, prostaglandins, serotonin, and even caffeine. Many foods, especially those that are acidic, can increase transit. Some people are intolerant of specific foods and always develop diarrhea after eating them. Stress and anxiety are also common causes.
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vagus nerve 
