Gastrointestinal infections (37%) and food poisoning are the two most common causes of acute nausea and vomiting.[1] Side effects from medications (3%) and pregnancy are also relatively frequent.[1] There are many causes of chronic nausea.[1] Nausea and vomiting remain undiagnosed in 10% of the cases, with rates about 6% in children and more than 16% in people aged more than 65 years.[8]