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In medicine, polyphagia (sometimes known as hyperphagia) is a medical sign meaning excessive hunger and abnormally large intake of solids by mouth.auses of increased appetite include: 1  Anxiety. 2  Depression. 3  Certain drugs. 4  Diabetes mellitus. 5  Hyperthyroidism. 6  Hypoglycemia.
Medical Definition of monophasic. 1  1: having a single phase; specifically : relating to or being a record of a nerve impulse that is negative or positive but not both a monophasic action potentialâcompare diphasic b, polyphasic 1. 2: having a single period of activity followed by a period of rest in each 24-hour period humans are naturally monophasic beings.