In children vomiting is far from rare, as most parents can testify. However, CVS is very different from the normal vomiting we are all familiar with in children who are ill, eat too much or suffer motion sickness. The most obvious thing is that the vomiting doesn't stop.

Severe and constant, unremmitting nausea

Onset of vomiting is most commonly during the night or early morning

Repeated vomiting, peaking at up to 5-6 times per hour

Retching, often violently

Pallor, often extreme paleness of the skin

Headache

Abdominal pain

Low grade fever

Diarrhoea

Vomiting episodes may repeat with regular spacing of days or weeks

Lethargy or unresponsiveness

Dizziness

Excessive salivation, and/or spitting