Original
The cause of CVS is currently unknown, but there may be a link with migraines. Many people with CVS develop migraines, and migraine medicines have been shown to help treat the syndrome. Many affected individuals have a family history of related conditions, such as migraines, in their mothers and maternal relatives, suggesting mitochondrial inheritance. Single base-pair and DNA rearrangements in the mitochondrial DNA have been associated with these traits.
Vomiting episodes can sometimes be brought on by a trigger such as:
Emotional stress - excitement, anxiety or panic attacks
An infection such as a sinus infection or the flu
Certain foods such as chocolate, cheese, cured meats and foods containing MSG
Caffeine
Hot weather
Menstrual periods
Motion sickness
Unhealthy eating habits - overeating, going without food for too long, or eating just before bedtime
Physical exhaustion or too much exercise
Sleep deprivation