Autemesia is vomiting that comes from an unknown cause or etiology. This type of vomiting can be idiopathic or functional vomiting from an unknown internal source. Autemesia can also be vomiting that is caused by the gag reflex (such as self-induced regurgitating, such as is used in bulimia). The majority of humans have most likely had an occasion of sudden vomiting that was caused by something unknown - therefore most of us have experienced autemesia at some point.

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