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Polyphagia (consumption of food in excess) can be a result of abnormalities in the areas of the brain that control hunger. This may be related to trauma, tumors, infections, or stress.
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Abnormalities in the CNS can cause increased appetite, as can several other factors such as stress, an underlying disease, or a tumor.

Any alteration in your pet's eating behavior should be checked by the veterinarian.

Increased appetite is known as polyphagia in veterinary terms.

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