“Vomiting is defined as the forceful expulsion of gastric contents through the mouth and/or nose. Vomiting differs from gastroesophageal reflux (GER) and regurgitation in that the latter 2 conditions are characterized by effortless retrograde flow of duodenal or gastric fluids into the esophagus and oral cavity. Vomiting is also different from rumination syndrome, in which patients self-promote to electively regurgitate, and often chew and swallow their regurgitated food again.” (Shields and Lightdale. 2018)