Primary hyperhidrosis is a rare disorder characterized by excessive sweating on the palms of the hands, the soles of the feet, in the armpits (axillary), in the groin area, and/or under the breasts. The exact cause of primary hyperhidrosis is not known. When excessive sweating occurs as part of some other disorder, it is said to be secondary hyperhidrosis, which is a more commonly encountered condition than is primary hyperhidrosis.
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