Gustatory hyperhidrosis is excessive sweating that certain individuals regularly experience on the forehead (scalp), upper lip, perioral region, or sternum a few moments after eating spicy foods, tomato sauce, chocolate, coffee, tea, or hot soups.:777 This type of sweating is classified under focal hyperhidrosis, that is, it is restricted to certain regions of the body. A common cause is the result of trauma or damage of the nerve that passes through the parotid gland. This type of sweating is known as Frey's syndrome in which case the damage to the nerve is due to surgery of the parotid gland (parotidectomy). It has been observed in diabetics with autonomic neuropathy, and a variant of this disorder has been reported following surgical sympathectomy.
- James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology. (10th ed.). Saunders. ISBN 0-7216-2921-0.
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