List of diseases that include polyphagia as a symptom. Any major, well-known medical conditions associated with polyphagia are included below, listed alphabetically with photos when available. Any maladies, sicknesses or illnesses with polyphagia as a symptom can be seen below. For any real, further diagnosis of something you feel you might have, please consult a doctor. This list includes information about each disease, such as what risks are associated with it. List features illnesses like Diabetes mellitus, Type 2 diabetes.This list answers the questions, "What risks are associated with polyphagia?" and "What disease can I have if I have polyphagia?"