In some cases, an upset stomach is due to IBS, or Irritable Bowel Syndrome. Peppermint and peppermint oil can relieve some of the symptoms of IBS by relaxing the muscles in the digestive tract. When these muscles contract, resulting spasms can be painful and lead to diarrhea. Peppermint is safe to use for most people but should be avoided by people with hernias, kidney stones, and liver or gallbladder disorders. It may aggravate these conditions, so it is best to discuss the use of peppermint with a medical provider before trying it.

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