Retching
（重定向自Dry heaves）
Retching (also known as dry heaving) is the reverse movement (peristalsis) of the stomach and esophagus without vomiting. It can be caused by bad smell or choking, or by withdrawal from some medications after vomiting stops. Retching can also be as a result of an emotional response or from stress which produces the same physical reaction. The function is thought to be mixing gastric contents with intestinal refluxate in order to buffer the former and give it momentum in preparation of vomiting. Treatments include medication and correction of the fluid and electrolyte balance.