Psychogastroenterology of cyclic vomiting syndrome: A crucial need to build evidence.

Cyclic vomiting is a disorder of gut brain interaction (DGBI) emphasizing the need for treatment of both the brain and the gut. Despite clinical success of psychological therapies for CVS, also called brain-gut treatments, an evidence-base is lacking and these treatments are available in few GI practices. This has resulted in an "all guts no brain" approach to CVS. The current paper is a call to action to develop more evidence and use of brain-gut therapies in CVS.