Concerns / Medical and Skin / Excessive Sweating
Excessive sweating: causes, types,
and when it needs a doctor
Sweating more than the body needs to regulate its temperature has a medical name, a set of recognised causes, and an important distinction underneath it that determines whether the problem is a cosmetic concern or a sign of something requiring investigation.
Most excessive sweating is a benign, if genuinely distressing, condition. Some is not. Knowing which is which is the first and most important step.
Dr Ibrahim Hawli
MBBS · Registered Medical Practitioner
In short
Excessive sweating is called hyperhidrosis. It divides into primary, which is benign, usually starts young, affects specific areas symmetrically, and stops during sleep; and secondary, which can be caused by an underlying condition or a medication and requires that cause to be found. Sweating that starts suddenly in adulthood, happens at night, affects only one side, or comes with other symptoms points toward a secondary cause and should be assessed medically first. In Australia, severe underarm hyperhidrosis that has not responded to first-line treatment may qualify for a Medicare-subsidised pathway, assessed individually.
01 / The Condition
What excessive sweating is,
and its medical name
The medical term is hyperhidrosis. It means sweating in excess of what the body needs for normal temperature regulation.
Sweat is produced by eccrine glands, which are distributed across almost the entire skin surface and are densest in the underarms, palms, soles and face. In hyperhidrosis, those glands are structurally normal. The problem is that the nerve signal telling them to produce sweat is overactive.
In primary hyperhidrosis the sweat glands themselves are not diseased or abnormal. They are ordinary glands receiving an excessive instruction. That is why the condition is described as a disorder of nervous signalling rather than of the glands.
Hyperhidrosis affects an estimated 2.8 to nearly 5 per cent of people. It is far more common than most people assume, and far more common than most people admit.
02 / The Key Distinction
Primary and secondary:
the distinction that matters most
This is the single most important thing on this page, and it is the reason a medical assessment matters.
Type one
Primary hyperhidrosis
Benign. Overactive nerves supplying normal sweat glands, with no underlying disease. Focal, symmetric, usually begins in childhood or adolescence, often with a family history.
Type two
Secondary hyperhidrosis
Caused by something else: an underlying condition or a medication. Thyroid overactivity, diabetes, hormonal changes, certain infections, some neurological conditions, certain cancers, or a wide range of medications. Can be generalised rather than focal.
Primary hyperhidrosis is a quality-of-life condition that can be managed. Secondary hyperhidrosis is a signpost, and the correct response is to find and address what is causing it. Managing the sweating without investigating the cause, when the pattern suggests a secondary cause, means missing the underlying problem.
This is why a cosmetic clinic that offers to manage excessive sweating without taking a proper history is doing it wrong. The history is the safety step.
03 / Self-Check
The six-point self-check
for primary hyperhidrosis
There is a validated set of criteria with a positive predictive value of around 99 per cent. You can apply it to yourself before you come in.
Primary hyperhidrosis is likely where excessive sweating has been present for at least six months with four or more of the following:
01
It primarily affects the underarms, palms, soles or face
02
It is bilateral and roughly symmetric, affecting both sides fairly equally
03
It is absent during sleep
04
Episodes occur at least once a week
05
Onset was at age 25 or younger, often in childhood
06
There is a family history of the same thing
If most of these describe you, primary hyperhidrosis is likely, and it is a manageable condition. If they do not, particularly if your sweating began later in life, is one-sided, happens at night, or is generalised, a secondary cause needs to be considered and that is a reason to see a general practitioner first.
Bring your answers to these six points to your consultation. They are the starting point of the assessment.
04 / Safety
When excessive sweating
is a warning sign
Most excessive sweating is benign. The following patterns warrant medical assessment before anything else, because they suggest a secondary cause.
See a GP first if your sweating
- Began suddenly or recently, particularly in adulthood
- Occurs at night, soaking bedding or nightclothes
- Affects one side of the body only, or an unusual asymmetric area
- Is generalised over the whole body rather than focal
- Is accompanied by weight loss, fever, a racing heart, tremor, or feeling unwell
- Started after beginning a new medication
- Has changed in a long-standing pattern, in intensity or location
None of these means something serious is definitely present. All of them mean the sweating should be investigated medically rather than treated as a cosmetic concern.
Why night sweating changes the picture
Primary focal hyperhidrosis is characteristically absent during sleep. The overactive nerve signalling settles when you do. Someone who sweats through the night, waking with damp or soaked bedding, is not describing typical primary hyperhidrosis. Night sweats have their own list of causes that require medical assessment.
If your sweating wakes you or soaks your bedding, that is a conversation with a general practitioner, not a cosmetic consultation.
05 / Causes
What causes primary
hyperhidrosis
In primary hyperhidrosis, the sweat glands are normal. What drives the condition is overactivity in the sympathetic nerves that control them. The precise trigger is not fully understood, but several things are established.
Genetic component
A family history is common, and the tendency runs in families, which is why onset in childhood or adolescence with a relative who has the same thing is a classic pattern.
Emotional and thermal triggers
Anxiety, stress, excitement and heat all increase sympathetic outflow. In hyperhidrosis the baseline is already elevated and the triggers push it higher.
Not caused by poor hygiene, and not a sign of being unfit
Primary hyperhidrosis is a neurological signalling pattern, present in people of every body type and level of fitness. These misconceptions cause a great deal of unnecessary shame.
06 / Prevalence
Where it happens,
and how common it is
Primary hyperhidrosis is focal, and it has favourite sites. Many people have more than one. Survey estimates place it at roughly 3 to nearly 5 per cent of the population, affecting more than a million Australians.
~68%
Underarms
The most commonly affected area.
~65%
Palms
Closely behind, and palmar sweating often has the earliest onset, frequently before age 12.
Common
Soles
Commonly affected, often alongside the palms.
Less
Face and scalp
A smaller proportion, and craniofacial sweating can be particularly distressing socially.
It is under-reported because people adapt around it quietly, choosing clothing to hide it, avoiding handshakes, and rarely raising it with a doctor.
07 / Management
The approaches
that exist
Management is staged, usually starting with the simplest measures. Which approach suits you depends on the areas affected, the severity, what you have already tried, and your medical history.
01
Topical treatments
Clinical-strength antiperspirants containing aluminium salts work by blocking the sweat ducts, applied to dry skin at night. Prescription-strength topical options also exist. For milder cases they are enough.
02
Iontophoresis
Passes a weak electrical current through water to the skin, most useful for palms and soles. Requires repeated sessions but suits some people well.
03
Prescription oral medications
Can reduce sweating by acting on the nervous signalling. Considered in some cases, weighing benefits against side effects.
04
Energy-based and device approaches
Certain energy devices, including microwave-based and some laser and radiofrequency technologies, target the sweat glands directly. Regulated as medical devices and can be discussed by name at consultation.
05
Other medical approaches
Options that reduce the nerve signalling to the glands, discussed at consultation where appropriate.
06
Surgery
Exists for severe non-responsive cases. Not performed at this practice, and referral is the recommendation where appropriate.
08 / Worth Knowing
Excessive sweating
and Medicare in Australia
This is worth understanding before you assume that managing excessive sweating is entirely a private cost.
In Australia, severe primary hyperhidrosis of the underarms that has not responded to first-line topical treatment may be eligible for a Medicare-subsidised pathway, under criteria set by the Pharmaceutical Benefits Scheme.
Eligibility is specific and assessed individually. It generally depends on the severity of the condition, the area affected, and evidence that simpler treatments have been tried without adequate success.
The practical point is this: if your underarm sweating is severe and clinical-strength antiperspirants have not worked, it is worth asking whether you meet the criteria for a subsidised pathway. Many people do not realise one exists, because it is rarely explained clearly.
At consultation, Dr Hawli can assess whether your situation is likely to meet the current eligibility criteria and explain the pathway.
Eligibility criteria are set by Services Australia and the PBS and are subject to change. This page does not state specific criteria for that reason. Current requirements are confirmed individually.
09 / Assessment
How excessive sweating
is assessed
Where the history points to a secondary cause, the appropriate step is investigation of that cause, and referral is made accordingly.
- A full history, establishing the pattern against the primary versus secondary criteria
- Age of onset, family history, and whether the sweating stops during sleep
- Which areas are affected, and whether the pattern is symmetric
- Current medications, since several can cause secondary sweating
- Relevant medical history, including thyroid symptoms, weight change and general health
- The degree of impact on daily life, work and wellbeing
- Whether the pattern suggests a secondary cause requiring investigation
- Where indicated, a visualisation test such as the iodine-starch test, which maps exactly where sweat is being produced
- Whether anything is clinically appropriate, including referral to a GP where a secondary cause is suspected
10 / Before You Decide
What to know before
your consultation
Every medical approach carries potential risks as well as potential benefits, and none is without risk. The most important thing to understand before a hyperhidrosis consultation is that the first job is to establish whether your sweating is primary or secondary.
Where the pattern suggests a secondary cause, the appropriate step is medical investigation, and that may mean seeing a general practitioner before anything else. That is not a delay for its own sake. It is the safety step that a responsible assessment requires.
Bring a list of your current medications, and your answers to the six-point self-check above.
Assessed at consultation
Factors covered
- Whether the pattern fits primary or secondary hyperhidrosis
- Age of onset and family history
- Whether the sweating stops during sleep
- Current medications, several of which can cause sweating
- Thyroid symptoms, weight change, and general health
- Pregnancy or breastfeeding
- Any recent change in a long-standing pattern
- What you have already tried
- The impact on your daily life
Individual results vary. Not all approaches suit all people. In some cases the appropriate recommendation is investigation of an underlying cause rather than management of the sweating itself.
11 / What Happens
What happens at your consultation in Glenroy
Appointments run 30 to 45 minutes. A consultation fee applies and is confirmed when you book. No referral is required to attend, although for a suspected secondary cause a general practitioner is the appropriate first stop.
01
Discussion
Your sweating pattern, when it started, whether it stops at night, which areas are affected, family history, current medications, general health and what you have already tried.
02
Assessment
The pattern is measured against the primary versus secondary criteria, affected areas are identified, and where useful a visualisation test maps sweat production. The impact on your daily life is discussed.
03
Information
Whether your sweating fits a primary or secondary pattern, whether investigation of a cause is the right first step, what approaches are appropriate, whether you may be eligible for a subsidised pathway, risks, alternatives and the option of proceeding with nothing.
04
Decision
You are not asked to decide on the day. Time to consider information is part of informed consent.
12 / Location
Hyperhidrosis assessment
in Melbourne: where the clinic is
The practice is in Glenroy, in the City of Merri Bek, roughly 13 kilometres north of the central business district. The clinic is on Glenroy Road, close to Glenroy Station on the Craigieburn line and the Pascoe Vale Road corridor.
Patients attend from Glenroy, Hadfield, Fawkner, Oak Park, Gowanbrae, Pascoe Vale, Coburg North, Broadmeadows, Campbellfield and Craigieburn.
13 / Common Questions
Questions patients
ask
If your question is not answered here, ask it at your consultation. There is time set aside for exactly that.
Hyperhidrosis. It means sweating beyond what the body needs to regulate its temperature. It divides into primary, which is benign and usually starts young, and secondary, which is caused by an underlying condition or medication.
In primary hyperhidrosis, the sweat glands are normal but the nerves controlling them are overactive, with a strong genetic component. In secondary hyperhidrosis, the sweating is caused by something else, such as thyroid overactivity, diabetes, hormonal change, a medication, or another condition. The two require different responses.
Primary hyperhidrosis is likely if you have sweated excessively for at least six months with four or more of these: it affects the underarms, palms, soles or face, it is symmetric, it stops during sleep, it happens at least weekly, it began at 25 or younger, and there is a family history. If your sweating began later in life, is one-sided, or happens at night, it should be assessed medically first.
Usually not. Most is primary hyperhidrosis, which is benign. But sweating that starts suddenly in adulthood, happens at night, affects one side only, is generalised, or comes with weight loss, fever or feeling unwell can indicate a secondary cause and should be checked by a doctor.
That is characteristic of primary focal hyperhidrosis. The overactive nerve signalling driving it settles during sleep. This is actually a reassuring feature, because sweating that continues or worsens at night points toward a different, secondary cause that needs medical assessment.
No. Primary hyperhidrosis is a pattern of nerve signalling and occurs in people of every body type and fitness level. It is not caused by poor hygiene either. These misconceptions cause unnecessary shame around a common medical condition.
In Australia, severe primary underarm hyperhidrosis that has not responded to first-line topical treatment may be eligible for a Medicare-subsidised pathway under PBS criteria. Eligibility is specific and assessed individually. The current requirements are confirmed at consultation, as they are set nationally and can change.
The underarms most commonly, followed closely by the palms, then the soles, and less often the face and scalp. Many people have more than one area. Palms and soles together, or underarms and palms, are common combinations.
A consultation fee applies and is confirmed when you book.
Related concerns
Medical conditions assessed at this practice
Written and clinically reviewed by
Dr Ibrahim Hawli, MBBS
Level 1 Certification, American Academy of Aesthetic Medicine. Advanced training in non-surgical nasal work with Aesthetic Intelligence.
Last reviewed: [insert month year] · Next review due: [insert month year]
Your first step is
an assessment.
This page provides general information about a medical condition and does not constitute medical advice. Any medical approach carries risks. Individual outcomes vary and not all approaches suit all people. Where a secondary cause is suspected, medical investigation is recommended before management. Surgery is not performed at this practice. Any decision follows an individual consultation and assessment with a registered medical practitioner.