(VAH-mih-ting) 
The forceful ejection of some or all of the contents of the stomach through the mouth. Vomiting may be caused by many things, including certain smells, irritation to the stomach, infections, stress, pain, motion sickness, migraines, certain medicines, some diseases or conditions, and brain injury or concussion. It can also be a symptom of some cancers and a side effect of certain cancer treatments. Also called emesis.