Nausea

Nausea is a feeling of revulsion and disgust producing an effort at vomiting.Disease and injury of almost any part of the body, but especially of the digestive and genital organs, will cause nausea and vomiting. But some people will become nauseated at the sight or smell of something disagreeable or horrifying.

Neurotic people will become nauseated at the mere thought of something unpleasant to them or even when facing a slightly embarrassing situation. While in case of disease, nausea is a reflex act of trying to expel something disagreeable from the body, in the case of nausea of neurotics it is a purely mental escape mechanism to avoid an undesired person or situation by creating a "scene" and by throwing up the contents of one's stomach instead of having to answer explain or face antagonism