Research
Hyperhidrosis Statistics: Prevalence, Age, and Daily Impact
This page summarizes what population studies actually report about how common hyperhidrosis is, who it affects, and how it affects daily life. Every important figure is traced to the original study. Unless noted, all figures are self-reported survey estimates, not counts of clinical diagnoses.
Published 2026-07-12 · Last reviewed 2026-07-12 · Educational information, not medical advice.
Key statistics at a glance
4.8%
of the US population reported hyperhidrosis in 2016 (about 15.3 million people)
Doolittle 2016
2.8%
was the earlier 2004 US estimate (about 7.8 million) — a different survey, not proof of a real increase
Strutton 2004
8.8%
prevalence in the most-affected age band, 18–39
Doolittle 2016
65%
of affected people report underarm (axillary) sweating — the most common site
Doolittle 2016
70%
rate their sweating as severe (HDSS 3–4) in at least one body area
Doolittle 2016
27%
have ever been formally diagnosed; about half have never discussed it with a clinician
Doolittle 2016
How common is hyperhidrosis?
Two US surveys anchor most discussion of hyperhidrosis prevalence. The first, by Strutton and colleagues (2004), screened 150,000 US households by mailed survey and estimated a national prevalence of 2.8% — about 7.8 million people at the time. The second, by Doolittle and colleagues (2016), surveyed an online panel balanced to US Census parameters (8,160 respondents) and estimated 4.8% — about 15.3 million people. Both are self-reported survey estimates using screening questions, not tallies of confirmed diagnoses.
Why the 2.8% and 4.8% estimates differ
It is tempting to read 2.8% rising to 4.8% as hyperhidrosis becoming more common. That is not what the evidence supports. The two figures come from different studies with different methods (a mailed household survey versus an online panel), conducted twelve years apart, using different screening wording. The 2016 authors attribute their higher estimate to long-standing under-reporting by patients and under-recognition by clinicians, and note that higher international figures suggest 4.8% may itself be conservative. In short: the change is best read as a difference in measurement, not evidence of a real rise in prevalence.
Prevalence by age
In the 2016 US survey, prevalence was far from even across age groups. It peaked among younger adults and was lowest in the youngest and oldest groups.
| Group | Prevalence |
|---|---|
| Under 18 | 2.1% |
| 18–39 | 8.8% |
| 40–64 | 4.2% |
| 65+ | 2.1% |
Source: Doolittle et al., Arch Dermatol Res 2016. Chart is an original rendering of the study data.
Typical age of onset
Population surveys measure how many people currently report hyperhidrosis, not the age at which it began, so precise age-of-onset distributions are less well quantified. Clinically, primary focal hyperhidrosis is generally described as beginning in childhood or adolescence, which is consistent with the high prevalence seen in the 18–39 group. This is a clinical description from bodies such as the American Academy of Dermatology and the International Hyperhidrosis Society rather than a single population statistic.
Body areas most commonly affected
The 2016 US survey asked where people sweat excessively. The underarms were most common, but many people are affected in more than one area, so the figures below overlap rather than sum to 100%.
| Group | Prevalence |
|---|---|
| Underarms (axillary) | 65% |
| Head / face | 42% |
| Hands (palmar) | 40% |
| Feet (plantar) | 38% |
| Under the breasts | 29% |
Source: Doolittle et al., Arch Dermatol Res 2016. Chart is an original rendering of the study data.
The earlier 2004 survey similarly found the underarms prominent: of people with hyperhidrosis, 50.8% reported axillary sweating.
Severity and daily-life impact
Severity is often measured with the Hyperhidrosis Disease Severity Scale (HDSS), where a 3 or 4 means sweating that is barely tolerable or intolerable and frequently interferes with daily activities. In the 2016 US survey, 70% of affected people rated their sweating as severe (HDSS 3–4) in at least one body area; by site, severe ratings ranged from about 31% (under the breasts) to 54% (palms). Many respondents had not sought help: 60% did not think excessive sweating was a medical condition and 47% believed nothing could be done. These figures describe reported burden and beliefs; they do not establish cause and effect, and this page does not recommend or evaluate any treatment.
How many people seek medical help?
Under-recognition is a consistent theme. In the 2016 US survey, about half (51%) had ever discussed their sweating with a healthcare professional, and only 27% had been formally diagnosed (43% of adults, 73% of children). The Swedish general-population study similarly found that only a minority of affected people had sought care. Because most cases go undiagnosed, survey prevalence and clinically diagnosed prevalence are not the same thing.
International prevalence findings
Estimates outside the US vary widely — not mainly because sweating differs by country, but because studies define hyperhidrosis differently and survey different populations. The table below lists the headline figures with the population and method behind each, so they can be compared fairly. They should not be averaged into a single number.
| Study | Year | Country / population | Sample | Prevalence | Method | Key limitation |
|---|---|---|---|---|---|---|
| Strutton et al. | 2004 | US, general population | 150,000 households screened | 2.8% | Mailed self-report survey | Self-report; screening definition |
| Doolittle et al. | 2016 | US, general population | 8,160 respondents | 4.8% | Online panel survey | 4.5% response rate; self-report |
| Shayesteh et al. | 2016 | Sweden, ages 18–60 | 5,000 | 5.5% (severe 1.4%) | Randomized population questionnaire | Self-report |
| Fujimoto et al. | 2013 | Japan, ages 5–64 | 5,807 | 12.76% (any primary focal) | Questionnaire | Counts any focal site; broad definition |
| Augustin et al. | 2013 | Germany, employees (52 companies) | 14,336 | 16.3% | Workplace screening questionnaire | Employed adults; screening, not diagnosis |
| Tu et al. | 2007 | China, adolescents (Fuzhou) | 13,000 | 4.59% (palmar) | Questionnaire | Adolescents; palmar only |
Each row links to the original study. Figures are not directly comparable across studies.
| Group | Prevalence |
|---|---|
| 2004 (Strutton) | 2.8% (~7.8 million) |
| 2016 (Doolittle) | 4.8% (~15.3 million) |
Source: Strutton et al., JAAD 2004; Doolittle et al., Arch Dermatol Res 2016. Chart is an original rendering of the study data.
Why estimates vary
Four things drive most of the spread between studies:
- Definition. Some studies count any focal sweating; others count only diagnosed hyperhidrosis, or only one site such as the underarms or palms.
- Population. A general-population sample, a group of employees, and a cohort of adolescents will not produce the same figure.
- Method. Mailed surveys, online panels, and clinic questionnaires reach different people and get different response rates.
- Self-report versus diagnosis. Screening questions capture more people than formal diagnosis does, since most cases are never diagnosed.
These differences explain why credible estimates range from roughly 2.8% to 16.3% in the studies summarized here. A single headline number is only meaningful alongside its definition, population, and method.
Methodology and limitations
This page compiles published, peer-reviewed prevalence studies and describes what each measured. A few limitations apply throughout: almost all figures are self-reported rather than clinically confirmed; survey response rates can be low (the 2016 US survey had a 4.5% response rate); screening definitions differ between studies; and sex differences and precise ages of onset are not well established in these population surveys, so this page does not report a figure for either. Associations described here are not evidence of cause and effect, and nothing here is a diagnosis or medical advice.
Frequently asked questions
- How common is hyperhidrosis?
- The most-cited US estimate is 4.8% of the population (about 15.3 million people), from a 2016 survey by Doolittle and colleagues. An earlier 2004 survey estimated 2.8%. Studies in other countries report figures from roughly 4.6% to 16.3%, depending on how the condition is defined and who is surveyed.
- Did hyperhidrosis become more common between 2004 and 2016?
- There is no good evidence for that. The 2.8% and 4.8% figures come from two different surveys that used different methods (a mailed survey versus an online panel) twelve years apart. The 2016 authors attribute their higher figure to better ascertainment and long-standing under-reporting, not to a real rise in prevalence.
- What age group is most affected?
- In the 2016 US survey, prevalence was highest among adults aged 18–39 (8.8%) and lowest in children/adolescents and adults 65+ (2.1% each). Primary focal hyperhidrosis is generally described clinically as beginning in childhood or adolescence.
- Which body areas are most affected?
- In the 2016 US survey, the underarms were most common (65%), followed by the head or face (42%), hands (40%), feet (38%), and under the breasts (29%). Many people are affected in more than one area, so these figures overlap.
- How many people with hyperhidrosis get diagnosed or treated?
- In the 2016 US survey, only 27% had ever been formally diagnosed and about half had never discussed their sweating with a healthcare professional — often because they did not think it was a medical condition or believed nothing could be done.
- Are these numbers from medical diagnoses or from surveys?
- Almost all population prevalence figures for hyperhidrosis, including the US 2.8% and 4.8% estimates, come from self-report surveys using screening questions, not from confirmed clinical diagnoses. That is one reason estimates vary and should be read as approximate.
Sources
Primary peer-reviewed studies first, then reviews and institutional framing (secondary).
- Strutton DR, Kowalski JW, Glaser DA, Stang PE. US prevalence of hyperhidrosis and impact on individuals with axillary hyperhidrosis: results from a national survey. J Am Acad Dermatol. 2004;51(2):241–248. PubMed
- Doolittle J, Walker P, Mills T, Thurston J. Hyperhidrosis: an update on prevalence and severity in the United States. Arch Dermatol Res. 2016;308(10):743–749. Full text
- Shayesteh A, et al. Prevalence and characteristics of hyperhidrosis in Sweden: a cross-sectional study in the general population. Dermatology. 2016;232(5):586–591. PubMed
- Fujimoto T, et al. Epidemiological study and considerations of primary focal hyperhidrosis in Japan. J Dermatol. 2013;40(11):886–890. PubMed
- Augustin M, et al. Prevalence and disease burden of hyperhidrosis in the adult population. Dermatology. 2013;227(1):10–13. PubMed
- Tu Y, et al. Epidemiological survey of primary hyperhidrosis in adolescents in Fuzhou. Eur J Cardiothorac Surg. 2007;31(4):737–739. PubMed
- Oshima Y, et al. Hyperhidrosis: a targeted literature review of the disease burden. J Dermatol. 2023 (review — secondary). Wiley
- American Academy of Dermatology — Hyperhidrosis (institutional framing — secondary). aad.org
- International Hyperhidrosis Society (patient-facing framing — secondary). sweathelp.org
- NHS — Excessive sweating (hyperhidrosis) (institutional framing — secondary). nhs.uk
How to cite this page
Sweat Explained. Hyperhidrosis Statistics: Prevalence, Age, and Daily Impact. Published 2026-07-12; last reviewed 2026-07-12. Available at: https://sweatexplained.com/research/hyperhidrosis-statistics
Please cite the original studies for the underlying figures. Journalists are welcome to link to this page; the charts are original renderings of the cited data.