Focal hyperhidrosis, also known as primary hyperhidrosis, is a

disease A disease is a particular abnormal condition that adversely affects the structure or function (biology), function of all or part of an organism and is not immediately due to any external injury. Diseases are often known to be medical condi ...

characterized by an excessive sweating localized in certain body regions (particularly palms, feet and underarms). Studies suggest that this condition, affecting between 1% and 3% of the US population, seems to have a genetic predisposition in about two thirds of those affected. Focal

hyperhidrosis Hyperhidrosis is a medical condition in which a person exhibits excessive perspiration, sweating, more than is required for the Thermoregulation, regulation of body temperature. Although it is primarily a physical burden, hyperhidrosis can deterio ...

is sometimes referred to as ''The Silent Handicap'', as it has a significant impact on the quality of life, affecting the individual socially, psychologically, emotionally and professionally.

Genetics

In 2006, researchers uncovered that primary palmar hyperhidrosis, referring to excess sweating on the palms of the hands and feet, maps to the gene locus 14q11.2-q13. Based on previous research using mice and rats, researchers looked towards the role of aquaporin 5 (AQP5), a water channel protein, in human individuals with primary focal hyperhidrosis. AQP5 has been identified as a candidate gene in many hyperhidrosis studies. Using a family that had members with primary focal hyperhidrosis, researchers found that there was no connection between primary focal hyperhidrosis and AQP5. There was also no significant connection between the gene 14q11.2-q13 locus, which was linked to primary palmar hyperhidrosis, and primary focal hyperhidrosis in this family. The expression of the AQP5 protein and AQP5

mRNA In molecular biology, messenger ribonucleic acid (mRNA) is a single-stranded molecule of RNA that corresponds to the genetic sequence of a gene, and is read by a ribosome in the process of Protein biosynthesis, synthesizing a protein. mRNA is ...

was significantly higher in a patient group in comparison to the control group. In 2011, using a control group (individuals without primary focal hyperhidrosis) and a patient group (individuals with primary focal hyperhidrosis) researchers found that there was no difference between the number of sweat coils in the axillary

sweat glands Sweat glands, also known as sudoriferous or sudoriparous glands, , are small tubular structures of the skin that produce sweat. Sweat glands are a type of exocrine gland, which are glands that produce and secrete substances onto an epithelial sur ...

. This indicates that there is nothing morphologically different between individuals with and without primary focal hyperhidrosis. The discrepancies between the studies above call on further studies to confirm or deny the role of AQP5, and the role of other proteins, in hyperhidrosis. Beyond looking at the genes and individual proteins that play a role in primary focal hyperhidrosis, researchers have looked at the patterns of

heredity Heredity, also called inheritance or biological inheritance, is the passing on of traits from parents to their offspring; either through asexual reproduction or sexual reproduction, the offspring cells or organisms acquire the genetic infor ...

for this trait. In a 2003 study, using multiple families, researchers found that primary focal hyperhidrosis was not a sex-linked gene, since male-to-male transmission was seen in multiple families. Instead evidence supported an

autosomal dominant In genetics, dominance is the phenomenon of one variant (allele) of a gene on a chromosome masking or overriding the Phenotype, effect of a different variant of the same gene on Homologous chromosome, the other copy of the chromosome. The firs ...

pattern of inheritance with an incomplete disease penetrance. 21 patients in this study reported a positive family history of hyperhidrosis (62%). Researchers were able to uncover this by creating pedigrees of all the participants in the study. Not every member of the pedigree exhibited forms of hyperhidrosis, which allowed the researchers to track the patterns of inheritance. The findings in this study indicated that primary focal hyperhidrosis is typically an hereditary disorder.

Diagnosis

Typical regions of excessive sweating include the hand palms, underarms, the sole of the foot, and sometimes groin, face, and scalp. Indeed, profuse sweating is present mostly in the underarms, followed by the feet, palms and facial region. Evidence demonstrates that a positive family history is also present (see the ''Genetics'' part).

Treatments

The Canadian Hyperhidrosis Advisory Committee has published a comprehensive set of guidelines which outlines key aspects of treatment related to this condition. Topical hyperhidrosis gels containing aluminum chloride hexahydrate are usually first choice treatments for this condition. In addition to topical antiperspirants (whose main active ingredients usually are aluminum or zirconium salts) treatment options include: iontophoresis (hands, feet), onabotulinumtoxinA (

Botox Botulinum toxin, or botulinum neurotoxin (commonly called botox), is a neurotoxic protein produced by the bacterium ''Clostridium botulinum'' and related species. It prevents the release of the neurotransmitter acetylcholine from axon endi ...

) injections (underarms, hands, feet, and other localized areas), electromagnetic/microwave energy thermolysis of underarm sweat glands ( miraDry), laser-assisted removal of the sweat glands (underarms), other local procedures such as liposuction and curettage of the sweat glands (underarms), medications of the anticholinergic type that are taken by mouth, and sympathectomy surgery for sweating of the hands or head that can't be controlled by other means. Sofpironium bromide is approved for the treatment of primary axillary hyperhidrosis.

References

External links

{{Authority control Cutaneous conditions