There are various medical causes of vomiting such as gastritis, gastric ulcer, gall stones, gastric reflux or GERD, brain tumor, liver infection, obstruction to intestine, migraine, and hyperthyroidism.
18 year olds are very conscious of the way they look. Hence, it could be a case of induced vomiting or bulimia, in order to avoid weight gain and look slim. Please go through the list and see which cause has not been looked into at the hospital.
Please consult a gastroenterologist or your PCP regarding this as a confirmed diagnosis cannot be given over the internet. Hope this helps. Take care!
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