There is another condition, cyclic vomiting, which is sometimes considered in children whose
vomiting has gone on for a significant period of time with
no other diagnostic explanation. This unusual condition has no known cause, and no clear treatment. It can be seen in adults but is most common in kids aged three to seven years old. It is probably more common than some may think, occurring in one out of fifty children with prolonged vomiting, and the symptoms can be quite profound.