Cyclic Vomiting Syndrome

Cyclic vomiting syndrome, or CVS, is a disorder that causes sudden, repeated attacks—called episodes—of severe nausea and vomiting. Episodes can last from a few hours to several days. Episodes alternate with longer periods of no symptoms.

The main symptoms of cyclic vomiting syndrome are sudden, repeated attacks—called episodes—of severe nausea and vomiting. Episodes can last from a few hours to several days. Experts aren’t sure what causes cyclic vomiting syndrome.

Doctors diagnose cyclic vomiting syndrome based on family and medical history, a physical exam, medical tests, and the pattern or cycle of symptoms. Medical tests can rule out other diseases and conditions that cause cyclic vomiting symptoms.

How doctors treat cyclic vomiting syndrome depends on the phase. Your doctor may prescribe medicines to treat episodes, or to help prevent episodes or reduce their frequency. Your doctor may recommend ways to avoid or manage conditions and events that trigger episodes.

You can help prevent cyclic vomiting episodes by avoiding foods that may trigger them. Your diet will not help relieve episodes but will help you recover and keep you healthy. You should eat well-balanced and nutritious meals between episodes.

The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) and other components of the National Institutes of Health (NIH) conduct and support research into many diseases and conditions.