What is (are) Cyclic Vomiting Syndrome ?
Cyclic vomiting syndrome, sometimes referred to as CVS, is an increasingly recognized disorder with sudden, repeated attacksalso called episodesof severe nausea, vomiting, and physical exhaustion that occur with no apparent cause. The episodes can last from a few hours to several days. Episodes can be so severe that a person has to stay in bed for days, unable to go to school or work. A person may need treatment at an emergency room or a hospital during episodes. After an episode, a person usually experiences symptom-free periods lasting a few weeks to several months. To people who have the disorder, as well as their family members and friends, cyclic vomiting syndrome can be disruptive and frightening.
                
The disorder can affect a person for months, years, or decades. Each episode of cyclic vomiting syndrome is usually similar to previous ones, meaning that episodes tend to start at the same time of day, last the same length of time, and occur with the same symptoms and level of intensity.