Complications of Cyclic Vomiting Syndrome

The severe vomiting that defines CVS is a risk factor for several complications:

• Dehydration. Vomiting causes the body to lose water quickly.
  
  
• Electrolyte imbalance. Vomiting also causes the body to lose the important salts it needs to keep working properly.
  
  
• Peptic esophagitis. The esophagus (the tube that connects the mouth to the stomach) becomes injured from the stomach acid that comes up with the vomit.
  
  
• Hematemesis. The esophagus becomes irritated and bleeds, so blood mixes with the vomit.
  
  
• Mallory-Weiss tear. The lower end of the esophagus may tear open or the stomach may bruise from vomiting or retching.
  
  
• Tooth decay. The acid in the vomit can hurt the teeth by corroding the tooth enamel.

source: http://digestive.niddk.nih.gov/ddiseases/pubs/cvs/index.htm