• The exact underlying cause of CVS is unknown.
• Possible causes include:
  • Genes
  • Digestive difficulties
  • Issues with the nervous system
  • Hormone imbalance
  • Hot weather
  • Too much exercise
  • Menstruation 
  • Anxiety or panic attacks, particularly in adults
  • Drinks such as alcohol and caffeine
  • Foods such as chocolate or cheese 
  • Over eating or fasting 
  • Physical exhaustion
  • Allergies or sinus problems

Click the link to learn more about the causes of CVS: https://www.niddk.nih.gov/health-information/digestive-diseases/cyclic-vomiting-syndrome/symptoms-causes