polyphagia

Polyphagia means "eating too much." It derives from the Greek words πολύς (polys) which means "very much", and φαγῶ (phago), verb for "I eat"
In medicine, polyphagia (sometimes known as hyperphagia) is a medical sign meaning excessive hunger and abnormally large intake of solids by mouth.
Disorders such as diabetes, Kleine Levin Syndrome (a malfunction in the hypothalamus), the genetic disorders Prader-Willi Syndrome and Bardet Biedl Syndrome can cause hyperphagia (compulsive hunger)

Causes of Polyphagia:

The following medical conditions are some of the possible causes of Polyphagia. There are likely to be other possible causes, so ask your doctor about your symptoms.

• Bulimia
• Anxiety
• Diabetes mellitus
• Premenstrual syndrome
• Migraine
• Thyrotoxicosis
• Corticosteroids
• Antidepressants
• Pregnancy
• Bulimia nervosa
• Graves disease
• Bipolar disorder
• Mania
• Hypoglycaemic attack
• Brain injury
• Tapeworms
• Craniopaharyngioma
• Encephalitis
• Recovery from illness
• Depression
• Strenuous exercise

Read more at http://www.wrongdiagnosis.com/symptoms/polyphagia/causes.htm?ktrack=kcplink