Introduction
Background
Hyperhidrosis, which is sweating in excess of that required for normal thermoregulation, is a condition that usually begins in either childhood or adolescence. Although any site on the body can be affected, the sites most commonly affected are the palms, soles, and axillae. This condition may be idiopathic or secondary to other diseases, metabolic disorders, febrile illnesses, or medication use. Hyperhidrosis exists in 3 forms: emotionally induced (in which it affects the palms, soles, and axillae1,2 ), localized, or generalized. The condition often causes great emotional distress and occupational disability for the patient, regardless of the form.
Pathophysiology
Generalized hyperhidrosis may be the consequence of autonomic dysregulation, or it may develop secondary to a metabolic disorder, febrile illness, or malignancy. In its localized form, hyperhidrosis may result from a disruption followed by abnormal regeneration of sympathetic nerves or a localized abnormality in the number or distribution of the eccrine glands, or it may be associated with other (usually vascular) abnormalities.
Essential hyperhidrosis, a disorder of the eccrine sweat glands, is associated with sympathetic overactivity.3 It does not appear to be a generalized disorder involving vascular endothelium.
Frequency
United States
In adolescents and young adults, an incidence of 0.6-1.0% is reported.4
International
Palmoplantar hyperhidrosis occurs 20 times more frequently in the Japanese than in any other ethnic group.5,6
Mortality/Morbidity
Hyperhidrosis is not associated with mortality. Severe cases of hyperhidrosis may adversely affect the patient's quality of life (see Complications).
Race
All races can be affected; however, Japanese are reportedly affected more than 20 times more frequently than other ethnic groups.5,6
Sex
Both sexes can be affected by hyperhidrosis.
Age
Persons of all ages can be affected by hyperhidrosis. Localized hyperhidrosis, unlike generalized hyperhidrosis, usually begins in childhood or adolescence. In a study of 850 patients with palmar, axillary, or facial hyperhidrosis, 62% of patients reported that sweating began since before they could remember; 33%, since puberty; and 5%, during adulthood.7
Clinical
History
- Essential hyperhidrosis is a dermatologic and neurologic disorder characterized by excessive sweating of the eccrine sweat glands.8
- Patients note excessive sweating in affected areas, which ultimately prompts them to seek medical attention.
- Palmoplantar hyperhidrosis (excessive sweating of the palms and soles) is observed in persons with chronic alcoholism.9
- Localized hyperhidrosis, unlike generalized hyperhidrosis, usually begins in childhood or adolescence.
- Hyperhidrosis beginning later in life should prompt a search for secondary causes such as systemic diseases, adverse effects of medication use, or metabolic disorders.
- Harlequin syndrome is characterized by unilateral hyperhidrosis and flushing, predominantly induced by heat or exercise.10 The sympathetic deficits are usually limited to the face.
- An echo-Doppler study found impaired left ventricular filling in patients with essential hyperhidrosis, which is associated with cardiac autonomic dysfunction because sympathetic fibers to eccrine glands of the palms of the hand arise from stellate and upper thoracic ganglia, which also innervate the heart.8 This study indicated that hyperactivity of the sympathetic nervous system in patients with hyperhidrosis may alter cardiac function in the long term.
- The temperament and character profile for patients with essential hyperhidrosis has stimulated interest,11 but data suggest that hyperhidrosis is not related to social phobia or personality disorder.
Physical
- Visible signs of hyperhidrosis are clearly evident.
- If direct visualization of the affected areas is desired, the iodine starch test may be used.
- This test requires spraying of the affected area with a mixture of 0.5-1 g of iodine crystals and 500 g of soluble starch.
- Areas that produce sweat will turn black.
Causes
Hyperhidrosis may be idiopathic or secondary to other diseases, metabolic disorders, febrile illnesses, or medication use.
- Generalized hyperhidrosis may be secondary to numerous conditions including the following:
- Neurologic or neoplastic diseases
- Metabolic disorders or processes (eg, thyrotoxicosis, diabetes mellitus, hypoglycemia, gout, pheochromocytoma, menopause)
- Febrile illnesses
- Medications: Use of medications may affect one or more components of human thermoregulation and induce hyperhidrosis. Agents such as propranolol, physostigmine, pilocarpine, tricyclic antidepressants, and serotonin reuptake inhibitors have been implicated. Efavirenz was recently described to induce excessive nocturnal sweating that resolved after dose reduction.12 The clinical trial Excessive Sweating Caused by Antidepressants: Measurement and Treatment With Terazosin (ADIES) is currently recruiting.
- Chronic alcoholism
- Hodgkin disease or tuberculosis (in nocturnal hyperhidrosis)
- Localized unilateral or segmental hyperhidrosis is rare and of unknown origin. The condition usually presents on the forearm or forehead in otherwise healthy individuals, without evidence of the typical triggering factors found in essential hyperhidrosis. Unilateral hyperhidrosis with accompanying contralateral anhidrosis is also rare.13 Unilateral hyperhidrosis has been described on the right sides of the forehead, the nose, and the palmar surface of the right hand, with anhidrosis on the left hand.
- Localized hyperhidrosis may also be associated with the following:
- Gustatory stimuli (associated with Frey syndrome, encephalitis, syringomyelia, diabetic neuropathies, herpes zoster parotitis, and parotid abscess)
- Eccrine nevus
- Eccrine angiomatous hamartoma
- Blue rubber-bleb nevus
- Glomus tumor
- Peripheral neuropathy, organomegaly, endocrinopathy, monoclonal plasma-proliferative disorder, and skin changes (POEMS) syndrome
- Burning feet syndrome
- Pachydermoperiostosis
- Pretibial myxedema
More on Hyperhidrosis |
Overview: Hyperhidrosis |
| Differential Diagnoses & Workup: Hyperhidrosis |
| Treatment & Medication: Hyperhidrosis |
| Follow-up: Hyperhidrosis |
| References |
| Next Page » |
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Further Reading
Keywords
hyperhidrosis, excessive sweating, palmoplantar hyperhidrosis, emotionally induced hyperhidrosis, generalized hyperhidrosis, localized hyperhidrosis, palmoplantar sweating, axillary hyperhidrosis, nocturnal hyperhidrosis
Overview: Hyperhidrosis