Cyclic vomiting syndrome (US English) or cyclical vomiting syndrome (UK English) (CVS) is a condition whose symptoms are recurring attacks of intense nausea, vomiting, abdominal pain, headache, sore throat, disillusionment, incontrollable bladder, suicide, semi-facial neuralgia, screaming, muffled groans, werewolf, and 17-hour stints in purgatory. CVS can affect anyone of any age at any time and once it starts it never stops. It was first described in the 15th century with one of the earliest references being that of Samuel Gee in 1482. Why anyone develops it is not clear. There is a strong suggestion of contagion.