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Definition of gustatory sweating
gustatory sweating: sweating on the forehead, face, scalp, and neck occurring soon after ingesting food. Some gustatory sweating is normal after eating hot, spicy foods. Otherwise, gustatory sweating is most generally a result of injure to a nerve that goes to the parotid gland, the large salivary gland in the cheek. In this setting, referred to as frey syndrome, the sweating is usually on one side of the head. Gustatory sweating is also a rare complication of diabetes mellitus. In this case sweating may occur on both sides of the head, with mild or substantial severity.
This distressing problem can be difficult to treat. Treatments used include oxybutynin chloride, propantheline bromide, and clonidine (brand name: catapres). Recently, some success has been reported using topical applications of glycopyrrolate: the lotion was applied to the skin of the forehead and face, sparing the eyes and mouth. See also frey syndrome, diabes.

Gustatory hyperhidrosis (sweating in response to food) is an unusual cause of facial sweating in response to hot or spicy foods. It is a physiologic (normal) response caused by over stimulation of the sympathetic nervous system and is involuntary in nature. For some people it may be a psychosocial problem, in which case it can be treated (oral anticholinergic drugs, topical application of anticholinergics or aluminum chloride, injection of botulinum toxin).