Cyclical vomiting syndrome is a disorder of unknown aetiology, characterised by recurrent stereotypic episodes of nausea and vomiting, with full recovery between attacks.¹ The onset may be within the first three years of life,² although UK studies have found the average age of onset to be 5.3 years.³ Childhood co-morbidities include motion sickness, constipation, and abdominal migraine.⁴ Exacerbations can be triggered by physical factors (infection, tiredness, pain, exercise, foods) and psychological stresses, both positive and negative. The attacks usually …