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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.
1 Preparation for migration and for winter requires a period of hyperphagia and a laying down of fat reserves. 2  Although hyperphagia is well documented during and prior to migration, it is not known whether it persists until birds reach their breeding grounds. Although hyperphagia is well documented during and prior to migration, it is not known whether it persists until birds reach their breeding grounds. 2  Children with Prader-Willi syndrome show extreme hyperphagia and obsessive-compulsive behavior.