Causes

The underlying cause of cyclic vomiting syndrome is unknown. Some possible causes include genes, digestive difficulties, nervous system problems and hormone imbalances. Specific bouts of vomiting may be triggered by:

• Colds, allergies or sinus problems
• Emotional stress or excitement, especially in children
• Anxiety or panic attacks, especially in adults
• Certain foods and drinks, such as alcohol, caffeine, chocolate or cheese
• Overeating, eating right before going to bed or fasting
• Hot weather
• Physical exhaustion
• Exercising too much
• Menstruation
• Motion sickness

Identifying the triggers for vomiting episodes may help with managing cyclic vomiting syndrome.