Peppermint is a plant. The leaf and oil are used as medicine. Peppermint is used for the common cold, cough, inflammation of the mouth and throat, sinus infections, and respiratory infections. It is also used for digestive problems including heartburn, nausea, vomiting, morning sickness, irritable bowel syndrome (IBS), cramps of the upper gastrointestinal (GI) tract and bile ducts, upset stomach, diarrhea, bacterial overgrowth of the small intestine, and gas.
Some people also use peppermint for menstrual problems, liver and gallbladder complaints, and as a stimulant.
Peppermint oil is applied to the skin for headache, muscle pain, nerve pain, toothache, inflammation of the mouth, joint conditions, itchiness, allergic rash, bacterial and viral infections, relaxing the colon during barium enemas, and for repelling mosquitoes.
Some people inhale peppermint oil for treating symptoms of cough and colds, and as a painkiller.