Cyclic vomiting is a condition that involves recurrent episodes of severe nausea, vomiting and exhaustion with periods of completely normal health in between. There is no known cause for the recurrent symptoms and the episodes can last from several hours to a few days.
Cyclic vomiting can be so severe that it keeps the affected person from participating in their daily activities, and may require treatment in the emergency room. Each episode usually mirrors the previous ones, and can occur on the same day, for the same length of time and with the same level of intensity. Cyclic vomiting can affect a person for months, years or even decades.