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In page Sweat gland:

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; Hyperhidrosis: (also known as polyhidrosis or sudorrhea) is a pathological, excessive sweating that can be either generalized or localized (focal hyperhidrosis); focal hyperhidrosis occurs most often on the palms, soles, face, scalp and axillae. Hyperhidrosis is usually brought on by emotional or thermal stress,[4] but it can also occur or with little to no stimulus.[3] Local (or asymmetrical) hyperhidrosis is said to be caused by problems in the sympathetic nervous system: either lesions[4] or nerve inflammation.[5] Hyperhidrosis can also be caused by trench foot or encephalitis.[5]