Hormone Journal

Hyperhidrosis

Pronounced: high-per-high-DROH-sis

Also known as: excessive sweating

Medically reviewed by Hormone Journal Editorial Team · Last reviewed 2026-05-22

Hyperhidrosis is excessive sweating beyond what the body needs for temperature regulation, affecting an estimated 3–5% of the population and often linked to hormonal or autonomic nervous system causes.

What it is

Hyperhidrosis is a medical condition in which the sweat glands produce far more sweat than the body requires for temperature regulation, affecting an estimated 3–5% of the population and significantly impairing quality of life, confidence, and daily functioning. Also called excessive sweating, hyperhidrosis can involve the armpits, palms, soles, face, or the entire body surface, and it can occur at any ambient temperature — including during sleep.

The condition divides into two clinically distinct types:

TypeTriggerTypical distributionOnset
Primary (idiopathic)Overactive sympathetic nerve signals; no underlying diseaseFocal: palms, soles, underarms, faceChildhood or adolescence
SecondaryUnderlying medical condition, most often hormonalGeneralized or atypical areasAny age; new onset in adults warrants investigation

Despite effective treatments being available, many people never raise the issue with a clinician — often out of embarrassment or the mistaken belief that nothing can be done.

Causes and mechanism

Primary hyperhidrosis arises from overstimulation of cholinergic receptors on eccrine sweat glands, driven by an overactive sympathetic nervous system rather than any identifiable disease. The acetylcholine negative-feedback loop appears impaired. There is a clear genetic component: the condition runs in families, though the exact genes involved have not been fully characterized.

Secondary hyperhidrosis is sweating caused by an identifiable underlying condition. Hormonal disorders are the most common category:

  • Menopause and perimenopause — declining estrogen destabilizes the hypothalamic thermoregulatory centre, narrowing the thermoneutral zone and triggering inappropriate heat-dissipation responses (hot flashes, night sweats). Up to 80% of women experience vasomotor symptoms around the menopause transition, making this the single most common hormonal cause of secondary hyperhidrosis.
  • Hyperthyroidism — excess thyroid hormone accelerates metabolism, increasing heat production and sweating.
  • Diabetes — hypoglycemia triggers adrenaline release, causing acute sweating; autonomic neuropathy can produce abnormal sweating patterns independent of blood glucose.
  • Acromegaly — excess growth hormone raises metabolic rate and sweat gland activity.
  • Cushing's syndrome — excess cortisol can increase sweating.
  • Pheochromocytoma — a rare adrenal tumor causing episodic adrenaline surges with sweating, headache, and hypertension as hallmark features.

Non-hormonal secondary causes include infections (tuberculosis, HIV), certain medications (SSRIs, opioids, some antihypertensives), anxiety disorders, and obesity.

Symptoms and diagnosis

Primary hyperhidrosis typically presents as symmetric, focal sweating of the palms, soles, underarms, or face that interferes with daily tasks — difficulty gripping objects, visibly soaked clothing — and notably does not occur during sleep.

Secondary hyperhidrosis tends to be more generalized, may occur at night, and is accompanied by symptoms of the underlying condition: palpitations and heat intolerance in hyperthyroidism, hot flashes in menopause, episodic headache in pheochromocytoma.

A standard diagnostic workup includes:

  1. Detailed history: focal vs. generalized pattern, day vs. night, onset, medications, family history
  2. Thyroid function tests (TSH, free T3, free T4)
  3. Fasting glucose and HbA1c
  4. Hormone panel: FSH, estradiol, and others guided by clinical picture
  5. 24-hour urine catecholamines or plasma metanephrines if pheochromocytoma is suspected
  6. Starch-iodine test to map sweat distribution and guide treatment planning

In Canada, baseline bloodwork is typically ordered through a family physician and processed at LifeLabs or Dynacare. Specialist referral (endocrinology, dermatology) is available through the provincial system when secondary causes are suspected or first-line treatments fail.

Treatment options

Treatment is matched to the underlying type and cause.

Secondary hormonal hyperhidrosis: Treating the root cause is the most effective strategy. Hormone therapy (HT) for menopausal sweating, anti-thyroid medication or radioiodine for hyperthyroidism, and optimized glucose management for diabetes all reduce sweating by correcting the hormonal driver.

Primary hyperhidrosis (stepwise approach):

  • Prescription-strength aluminum chloride antiperspirants — first-line; applied to affected areas at night. Significantly more effective than over-the-counter formulations.
  • Iontophoresis — a mild electrical current passed through water in which hands or feet are submerged; well-supported for palmar and plantar hyperhidrosis.
  • Botulinum toxin (Botox) injections — injected intradermally into underarms, palms, or soles to block nerve signals to sweat glands. Health Canada has approved botulinum toxin for axillary hyperhidrosis; results typically last 6–12 months.
  • Oral anticholinergics (glycopyrrolate, oxybutynin) — reduce sweating systemically; side effects include dry mouth and blurred vision.
  • Microwave thermolysis (miraDry) — destroys underarm sweat glands using microwave energy; a non-surgical, permanent option for axillary hyperhidrosis.
  • Surgical sympathectomy — division of sympathetic nerves supplying the sweat glands; reserved for severe, refractory cases. Effective for palmar sweating but carries a meaningful risk of compensatory sweating elsewhere on the body.

When to see a clinician in Canada

Bring excessive sweating to a clinician's attention if it is affecting your work, relationships, or daily confidence; if sweating occurs predominantly at night; if it is accompanied by palpitations, unexplained weight loss, or heat intolerance; or if it is new in onset after years without the problem. New-onset generalized sweating in a middle-aged adult is more likely to reflect a secondary cause than primary hyperhidrosis and warrants investigation.

Canadian patients can start with their family physician or nurse practitioner. Virtual care platforms — including Maple, Felix, Cleo, Phoenix, and others — can facilitate initial assessment and prescription of first-line treatments. Dermatology or endocrinology referrals are available through provincial health systems when the workup points to a secondary cause or when escalated treatments such as botulinum toxin or sympathectomy are being considered. Coverage for botulinum toxin injections varies by province; patients should confirm with their provincial drug benefit program or private insurer.

Limitations and open questions

Research is still emerging on the precise neural mechanisms that cause primary hyperhidrosis, and no disease-modifying treatment currently exists — available therapies manage symptoms rather than correct the underlying nerve-signaling defect. The long-term outcomes of microwave thermolysis beyond five years are not yet well characterized. Health Canada has not issued specific clinical guidelines for hyperhidrosis management; Canadian clinicians generally follow guidance from the International Hyperhidrosis Society and the American Academy of Dermatology. Evidence on the optimal sequencing of treatments in adolescents is limited. For menopausal hyperhidrosis specifically, the risk-benefit profile of hormone therapy varies by individual, and the Society of Obstetricians and Gynaecologists of Canada (SOGC) recommends individualized assessment rather than a one-size-fits-all approach.

FAQs

Is hyperhidrosis a hormonal condition?

It can be. Secondary hyperhidrosis — where sweating is a symptom of an underlying condition — is frequently hormonal. Menopause-related sweating driven by declining estrogen is the most common example, affecting up to 80% of women around the menopause transition. Hyperthyroidism, diabetes, acromegaly, Cushing's syndrome, and rare adrenal tumors such as pheochromocytoma are other hormonal causes. Primary hyperhidrosis, where no underlying condition is found, has a neurological rather than hormonal basis, though hormonal fluctuations can worsen it.

Can menopause cause hyperhidrosis?

Yes. Hot flashes and night sweats in menopause are forms of thermoregulatory hyperhidrosis caused by declining estrogen. As estrogen falls, the hypothalamus becomes hypersensitive to small temperature changes, triggering inappropriate heat-dissipation responses — flushing and sweating — even when core body temperature has not meaningfully risen. For many women these are among the most disruptive menopausal symptoms. Hormone therapy (HT) is the most effective treatment for menopausal sweating and is endorsed for eligible women by the SOGC.

Is Botox for hyperhidrosis safe, and is it covered in Canada?

Botulinum toxin injections are a well-established treatment for axillary (underarm) hyperhidrosis and are approved by Health Canada for this indication. Because the injections are placed intradermally rather than into muscle, systemic effects are minimal. Results typically last 6–12 months, so repeat treatments are needed. Coverage varies: some provincial drug benefit programs and private insurers cover the cost, but many do not, making out-of-pocket costs a practical consideration. For palmar hyperhidrosis, the procedure is more painful and local anaesthesia is often used.

Does anxiety make hyperhidrosis worse?

Yes, significantly. Anxiety activates the sympathetic nervous system, which directly stimulates eccrine sweat gland activity. In people with primary hyperhidrosis, anticipatory anxiety about sweating in social situations creates a feedback cycle where the anxiety itself triggers more sweating, which in turn increases anxiety. Cognitive behavioural therapy (CBT) can help interrupt this cycle and is a recognized adjunct to physical treatments, particularly when hyperhidrosis is closely linked to social anxiety. Addressing both the physical and psychological dimensions typically produces better outcomes than treating either alone.

How is primary hyperhidrosis different from secondary hyperhidrosis?

Primary hyperhidrosis has no identifiable underlying cause: it results from overactive sympathetic nerve signals to eccrine glands, tends to begin in childhood or adolescence, affects specific focal areas (palms, soles, underarms, face) symmetrically, and does not occur during sleep. Secondary hyperhidrosis is caused by an underlying medical condition — most often hormonal — and typically produces more generalized sweating that can occur at night. Distinguishing the two matters clinically because secondary hyperhidrosis requires treating the root cause (e.g., thyroid disease, menopause), while primary hyperhidrosis is managed with targeted symptom-control therapies.

Sources

All glossary termsUpdated 2026-05-22