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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.
Dysphagia is the medical term for difficulty swallowing. When dysphagia is mild, it may cause an individual only to stop eating for a minute or less, but when it is severe, it can prevent an individual from taking in enough calories for adequate nutrition. Dysphagia has many causes.