What are the symptoms of Cyclic Vomiting Syndrome ?
The main symptoms of cyclic vomiting syndrome are severe nausea and sudden vomiting lasting hours to days. A person may also experience one or more of the following symptoms:
                
- retching, or making an attempt to vomit  - heaving or gagging  - lack of appetite  - abdominal pain  - diarrhea  - fever  - dizziness  - headache  - sensitivity to light
                
Intensity of symptoms will vary as a person cycles through four distinct phases of an episode:
                
- Prodrome phase. During the prodrome phase, the person feels that an episode of nausea and vomiting is about to start. Often marked by intense sweating and nauseawith or without abdominal painthis phase can last from a few minutes to several hours. The person may appear unusually pale.  - Vomiting phase. This phase consists of intense nausea, vomiting, and retching. Periods of vomiting and retching can last 20 to 30 minutes at a time. The person may be subdued and responsive, immobile and unresponsive, or writhing and moaning with intense abdominal pain. An episode can last from hours to days.  - Recovery phase. This phase begins when the vomiting and retching stop and the nausea subsides. Improvement of symptoms during the recovery phase can vary. Healthy color, appetite, and energy return gradually or right away.  - Well phase. This phase occurs between episodes when no symptoms are present.