Peppermint is one of the best carminative agents available. It has a relaxing effect on the visceral muscles, anti-flatulent properties and stimulates bile and digestive juice secretion, all of which help to explain its value in relieving intestinal colic, flatulent dyspepsia and other associated conditions. The volatile oil acts as a mild anaesthetic to the stomach wall, which allays feelings of nausea and the desire to vomit. It helps to relieve the vomiting of pregnancy and travel sickness. Peppermint plays a role in the treatment of ulcerative colitis and Crohns didease. Where migraine headaches are associated with the digestion, this herb may be used. As a nervine it acts as a tonic, easing anxiety, tension, hystera etc. The New Holistic Herbal by David Hoffmann Pg. 222