Hand Sweating

What Causes Hand Sweating? Information on the Causes and Diagnosis of Palmar Hyperhidrosis, Iontophoresis, Antiperspirants, Botulinum Toxin, and Other Treatment Options.

Hand Sweating (Palmar Hyperhidrosis)

Sweating of the hands is part of the body's natural temperature-regulation mechanism. Increased sweating in hot weather, during physical activity, fever, stress, or excitement can be a normal physiological response. However, if sweating occurs regardless of the body's need to cool down, continues even in cool environments, or becomes intense enough to noticeably affect daily life, it may be excessive hand sweating, known as palmar hyperhidrosis. The palms may stay slightly damp, or in more severe cases visible droplets of sweat may form and sweat may drip from the fingertips. Excessive hand sweating can affect writing, handling paper and documents, using electronic devices, gripping work tools, and physical contact. Primary palmar hyperhidrosis usually begins in childhood or adolescence. It typically affects both hands similarly and decreases during sleep. Some people may also have sweating of the feet, underarms, face, or scalp.

What Is Palmar Hyperhidrosis?

Palmar hyperhidrosis is excessive sweating that mainly affects the palms. The palms contain a large number of eccrine sweat glands. The activity of these glands is influenced by the sympathetic nervous system, which is part of the autonomic nervous system. People with primary palmar hyperhidrosis do not necessarily have more sweat glands than normal. The condition is mostly associated with excessive stimulation of normally structured sweat glands. Hand sweating can vary in severity:
  • Intermittent mild dampness of the palms
  • Wetness that leaves marks on paper
  • Moisture that makes it difficult to use touchscreens or electronic devices
  • Constant wetness of the palms
  • Visible droplets of sweat
  • In severe cases, sweat dripping from the fingertips
Sweating may vary throughout the day. Heat, physical activity, stress, excitement, and social situations can make symptoms worse. However, primary palmar hyperhidrosis cannot be explained by psychological factors alone.

How Does Hand Sweating Affect Daily Life?

The hands are used for communication, work, education, and most fine motor skills. For this reason, the impact of palmar hyperhidrosis on daily life may be greater than the amount of sweat produced alone would suggest. Excessive hand sweating can make the following more difficult:
  • Writing
  • Handling paper and documents
  • Using phones, tablets, and computers
  • Using touchscreens
  • Working with electronic equipment
  • Gripping pens and small tools
  • Playing musical instruments
  • Holding sports equipment
  • Working with technical or precision tools
  • Shaking hands and physical contact
Moisture on paper can cause difficulties at school or in the office. For people who work with technical, electronic, or precision equipment, constantly damp hands can also affect comfort at work. Some people may begin to avoid shaking hands or social situations in which their hands might be noticed. Worry about the sweating being noticed can also increase sympathetic nervous system activity. This can create a cycle in which sweating increases anxiety, and anxiety in turn increases sweating.

What Is Primary Palmar Hyperhidrosis?

Primary palmar hyperhidrosis is excessive hand sweating that cannot be explained by another disease or the effect of a medication. It usually:
  • Begins in childhood or adolescence
  • Affects both hands in a similar, relatively symmetrical way
  • Is recurrent
  • Is more noticeable during waking hours
  • Decreases or disappears during sleep
  • May increase with heat, stress, or excitement
  • May also occur in other members of the same family
Hand sweating is often accompanied by foot sweating in particular. Some people may also have excessive sweating of the underarms, face, or scalp. In primary palmar hyperhidrosis, the sweat glands are usually structurally normal. Excessive nerve stimulation reaching the sweat glands is considered one of the main mechanisms.

What Is Secondary Hand Sweating?

Hand sweating can sometimes occur in connection with another disease, a physiological change, or medications being used. This is called secondary hyperhidrosis. Features that may suggest a secondary cause include:
  • Sweating that begins for the first time in adulthood
  • A marked increase over a short period
  • Noticeably more sweating in one hand than the other
  • Sweating that continues during sleep
  • Sweating over large areas of the body
  • Accompanying fever, palpitations, or tremor
  • Unexplained changes in weight
  • Muscle weakness or neurological symptoms
  • Onset after starting a new medication
Conditions that may be associated with secondary sweating include:
  • Overactive thyroid gland
  • Low blood sugar
  • Diabetes
  • Menopause and hormonal changes
  • Febrile illnesses and certain infections
  • Certain neurological diseases
  • Conditions affecting the autonomic nervous system
  • Certain systemic diseases
  • Use of alcohol or certain substances
  • Side effects of certain medications
Even if a medication is thought to be increasing sweating, it should not be stopped without a physician's evaluation.

Is Hand Sweating Genetic?

Primary palmar hyperhidrosis can occur in more than one person in the same family. Excessive hand or foot sweating in a parent or sibling may suggest that a genetic predisposition plays a role. However, not everyone with palmar hyperhidrosis has a family history. Even within the same family, the age of onset, severity, and areas affected may differ.

Why Does Stress Increase Hand Sweating?

Stress, excitement, embarrassment, and anxiety can increase the activity of the sympathetic nervous system. This can lead to greater stimulation of the sweat glands in the palms. In people with primary palmar hyperhidrosis, this response may be more pronounced. Even the thought that one's hands will sweat during a handshake, meeting, presentation, or other social situation can trigger a new stress response and increase sweating. This does not mean that palmar hyperhidrosis is purely psychological. Palmar hyperhidrosis is a physical sweating disorder; however, emotional triggers can affect the severity of symptoms.

Does Hand Sweating Continue During Sleep?

Primary palmar hyperhidrosis usually decreases markedly or stops completely during sleep. If hand sweating continues throughout the night, other causes may need to be evaluated. These may include:
  • A very warm sleeping environment
  • Febrile illnesses
  • Certain infections
  • Hormonal or metabolic conditions
  • Certain medications
  • Night sweats affecting the whole body


Night sweats alone do not establish the diagnosis of a specific disease. The time of onset, distribution, and other accompanying symptoms are evaluated together.

Can Hand and Foot Sweating Occur Together?

Yes. Excessive sweating of the hands and feet commonly occurs together and may be called palmoplantar hyperhidrosis. The sweat glands in the palms and soles can respond similarly to sympathetic and emotional stimuli. Some non-surgical methods, such as iontophoresis, can be used on both the hands and the feet. Thoracic sympathetic surgery, on the other hand, affects the sympathetic nerve pathways inside the chest and is associated with certain types of upper-body hyperhidrosis. A reduction in hand sweating after surgery does not guarantee that foot sweating will decrease to the same extent. For this reason, foot sweating alone is not considered a routine reason for thoracic sympathetic surgery.

How Is the Severity of Hand Sweating Assessed?

The severity of palmar hyperhidrosis is not determined solely by measuring the amount of sweat. The assessment may take into account:
  • How often the sweating occurs
  • Whether both hands are affected
  • Whether visible droplets form
  • Whether writing is affected
  • Difficulties using electronic devices
  • Whether the use of tools or equipment is affected
  • Occupational limitations
  • Avoidance of physical contact
  • Skin problems
  • Response to previous treatments


Mild palmar hyperhidrosis may be limited to intermittent dampness. With moderate sweating, the hands may regularly become noticeably wet, and writing or using devices may sometimes become difficult. In severe palmar hyperhidrosis, visible droplets of sweat may form, and daily, occupational, or social activities may be significantly affected. This grouping is not a definitive laboratory classification.

How Is Palmar Hyperhidrosis Diagnosed?

The evaluation is mostly based on a detailed medical history and physical examination. The history may cover:
  • The age at which sweating began
  • How long it has been going on
  • Whether both hands are affected
  • Whether it continues during sleep
  • Situations that increase sweating
  • Family history
  • Medications being used
  • Other medical conditions
  • Whether there is sweating of the feet, underarms, face, or scalp
  • Its impact on daily life
  • Previous treatments


If there is a typical history consistent with primary palmar hyperhidrosis, extensive laboratory testing is not necessary for everyone. When secondary hyperhidrosis is suspected, depending on the person's symptoms, tests such as the following may be considered:
  • Blood sugar
  • Thyroid function tests
  • Blood count
  • Kidney and liver function
  • Tests related to infection or hormones
  • Review of medications being used

Are Sweat Tests Necessary for Hand Sweating?

Some tests may be used to show the distribution or amount of sweating. The starch-iodine test can help highlight areas of active sweating. Gravimetric methods can measure the amount of sweat produced over a given period of time. Other measurement techniques may also be used in some clinical or research settings. These tests are not necessary for everyone. For treatment planning, the medical history and the impact of sweating on daily life often provide more information than a single measurement of sweat volume.

Are There Other Conditions That Resemble Hand Sweating?

Moisture or sweating of the hands does not always mean primary palmar hyperhidrosis. Similar symptoms may be associated with:
  • Fever and infection
  • Low blood sugar
  • Thyroid diseases
  • Anxiety or panic attacks
  • Side effects of certain medications
  • Diseases affecting the autonomic nervous system
  • Certain skin diseases
  • Constant glove use
  • Hot, poorly ventilated work environments


Sweating that consistently affects only one hand is not typical of primary palmar hyperhidrosis. If one-sided sweating is accompanied by numbness, weakness, pain, or marked color changes, neurological or circulatory causes are also evaluated.

How Is Hand Sweating Treatment Planned?

The treatment approach is not the same for everyone. Planning takes into account:
  • Whether the sweating is primary or secondary
  • Its severity
  • Its impact on daily life
  • Skin type
  • Medications being used
  • Coexisting conditions
  • Previous treatments and the response to them


In primary palmar hyperhidrosis, treatment usually starts with less invasive methods. Options that may be considered include:
  • Adjustments to daily routines
  • Antiperspirants
  • Iontophoresis
  • Certain topical medications
  • Certain oral medications
  • Botulinum toxin injections
  • Psychological or behavioral approaches, when needed
  • Endoscopic thoracic sympathetic surgery in selected severe cases


If one method is not sufficient, this does not automatically mean that surgical treatment is required. The goal of treatment is not necessarily to make the hands completely dry, but to reduce the impact of sweating on daily functioning.

How Is Iontophoresis Used for Hand Sweating?

Iontophoresis is one of the non-surgical methods commonly used for primary palmar hyperhidrosis. During treatment, the hands are placed in special trays containing water, and a low-level electrical current is applied. Sessions may be repeated more frequently at the beginning of treatment. Once sweating has decreased, sessions can be continued at longer intervals to maintain the effect. The effect of iontophoresis is not permanent. When treatment is stopped, sweating may gradually increase again.

Possible effects include:
  • Tingling
  • Dry skin
  • Redness
  • Irritation
  • Discomfort at small cuts or cracks in the skin


For people with a pacemaker or certain implanted electronic devices, during pregnancy, and in certain health conditions, the suitability of the method is evaluated separately.

Topical Medications

Some topical medications that aim to reduce the nerve signals reaching the sweat glands may be used in the treatment of focal hyperhidrosis.

Some topical anticholinergic products may cause local or systemic effects such as:
  • Skin irritation
  • Dry mouth
  • Blurred vision
  • Dilation of the pupil if the medication comes into contact with the eye
  • Difficulty urinating


Because medications applied to the hands may be transferred to the eyes or other parts of the body, following the instructions for use is important. The approved uses and availability of these products may vary from country to country.

Oral Medications

Some anticholinergic medications can be used systemically to reduce the nerve signals involved in sweat production. These medications may affect sweating not only in the hands but also in other parts of the body.

Possible side effects include:
  • Dry mouth
  • Constipation
  • Blurred vision
  • Dry eyes
  • Difficulty urinating
  • Changes in heart rate
  • Drowsiness
  • Problems with concentration
  • Difficulty regulating body temperature in hot environments


Sweating is one of the body's natural temperature-control mechanisms. For this reason, suppressing sweat production over large areas is a concern, especially in hot weather, during fever, or during intense physical activity. Whether the medication is suitable is evaluated according to the person's age, overall health, and other medications they are taking.

Is Botulinum Toxin Used for Hand Sweating?

Botulinum toxin aims to temporarily reduce the chemical signaling between certain nerve endings and the sweat glands. It may be used in selected cases of palmar hyperhidrosis. Because the palm has many sensory nerve endings, the injections can be uncomfortable or painful, and pain-control methods may be needed. Its effect is not permanent, and sweating may increase again over time as nerve function is restored.

Possible side effects include:
  • Injection pain
  • Bruising
  • Temporary tenderness
  • Temporary muscle weakness
  • Temporary reduction in grip strength
  • Temporary difficulty with certain finger movements


In some people, these effects may temporarily affect daily tasks or work activities. The licensed uses of botulinum toxin for hyperhidrosis may differ from country to country.

Is There a Role for Anxiety and Stress Management?

Because stress can increase hand sweating, psychological or behavioral approaches may be helpful for people with significant anxiety or avoidance behaviors. These may include:
  • Relaxation techniques
  • Breathing exercises
  • Cognitive behavioral therapy
  • Evaluation of significant social anxiety
  • Reducing avoidance behaviors
These methods do not directly stop the sweat glands from working. The aim is to reduce the impact of the cycle in which anxiety increases sympathetic stimulation and increased sweating in turn leads to more anxiety. Using psychological support does not mean that palmar hyperhidrosis is imaginary or purely an emotional problem.

What Is the Role of ETS in Treating Hand Sweating?

Endoscopic thoracic sympathetic surgery, commonly called ETS, refers to surgical methods based on interrupting certain sympathetic nerve pathways inside the chest. Because the sympathetic nervous system plays a role in excessive hand sweating, ETS can reduce hand sweating in selected severe cases of primary palmar hyperhidrosis. However, surgery is generally not considered a first-line treatment. Surgical evaluation may be considered particularly when:
  • primary palmar hyperhidrosis has been confirmed,
  • the sweating is severe,
  • daily, occupational, or social activities are significantly affected,
  • adequate control cannot be achieved with appropriate non-surgical methods,
  • the permanent and unpredictable consequences of sympathetic surgery are understood.
Surgery is not the main approach for secondary hand sweating. The condition that may be causing the sweating is evaluated first.

Can ETS Be Reversed?

Sympathetic nerve surgery should not be regarded as a reliably reversible procedure. Different surgical techniques may affect the sympathetic nerve pathway in different ways. Although surgical clips are used in some procedures instead of cutting the nerve, the fact that a clip can later be removed does not mean that nerve function or the previous sweating pattern will necessarily return. Pressure-related changes, scar tissue, or other permanent effects may develop in the nerve tissue. For this reason, sympathetic nerve surgery is evaluated with its long-term outcomes in mind.

What Are the Possible Risks of ETS?

Being performed with a minimally invasive (closed) technique does not mean that thoracic sympathetic surgery is risk-free. Possible outcomes and complications include:
  • compensatory sweating,
  • excessive dryness of the hands,
  • persistent hand sweating,
  • recurrence of sweating,
  • different results in the two hands,
  • gustatory (taste-related) sweating,
  • pneumothorax,
  • hemothorax,
  • bleeding,
  • infection,
  • chest or nerve-related pain,
  • a decrease in heart rate,
  • Horner syndrome,
  • anesthesia-related complications
The likelihood of these risks may vary depending on the surgical technique, the extent of the procedure on the sympathetic nervous system, the person's anatomical features, and their overall health.

What Is Compensatory Sweating?

Compensatory sweating is new or increased sweating that appears after sympathetic surgery in areas of the body that previously sweated less. It most commonly occurs in areas such as the:
  • back,
  • chest,
  • abdomen,
  • lower back,
  • buttocks,
  • groin,
  • legs
Its severity can vary considerably from person to person. In some people it appears as mild dampness, while in others it may become intense enough to affect clothing and daily life. It may be more noticeable in hot weather, during physical activity, or under stress. There is no reliable test before surgery that can determine with certainty who will develop compensatory sweating or how severe it will be. No sympathetic surgery method completely eliminates this possibility.

Can the Hands Become Too Dry After Treatment?

After some treatments, especially sympathetic surgery, sweating in the palms may fall below the normal physiological level. Excessive dryness can cause:
  • tightness of the skin,
  • cracking,
  • peeling,
  • sensitivity,
  • a different sensation when gripping objects,
  • the need to use moisturizer more often
The goal of treatment is not to make the hands as dry as possible. It is also important to reduce sweating to a level that does not interfere with daily functioning while preserving normal skin function as much as possible.

Can Hand Sweating Return After Treatment?

The effect of most non-surgical methods used for palmar hyperhidrosis is temporary. When treatment is stopped or its effectiveness wanes, sweating may increase again. Even after surgery, sweating may not disappear completely or may return over time. Possible reasons for this include:
  • nerve anatomy that varies from person to person,
  • additional sympathetic nerve pathways,
  • changes in nerve conduction that develop over time,
  • the original sweating being due to a secondary cause
Mild physiological moisture in the palm does not always mean treatment failure.

Why Is Follow-Up After Treatment Important?

Follow-up involves more than just checking whether the palms are dry. The following may also be considered:
  • changes in everyday hand function,
  • skin dryness,
  • compensatory sweating,
  • changes in sweating of the feet or other areas,
  • gustatory (taste-related) sweating,
  • chest or nerve-related complaints after surgery,
  • recurrence of sweating,
  • effects and side effects of medications being used,
  • social and psychological effects.
The effectiveness and tolerability of non-surgical methods may also change over time.

When Is Medical Evaluation Important for Hand Sweating?

Sweaty hands do not always mean there is a disease. However, evaluating the cause of sweating becomes important when any of the following are present:
  • Sudden onset of sweating
  • Only one hand being affected
  • A marked difference between the two hands
  • Heavy sweating during sleep at night
  • Sweating that affects the whole body
  • Accompanying fever, palpitations, tremor, or unexplained weight changes
  • Symptoms appearing after starting a new medication
  • Numbness, weakness, pain, or marked color change
  • Sweating that significantly affects daily life
These features may require evaluation for causes other than primary palmar hyperhidrosis.

Frequently Asked Questions About Hand Sweating

What causes hand sweating?
The hands can normally sweat in hot weather, during physical activity, stress, or excitement. Heavy sweating that recurs without an obvious trigger and affects daily life, however, may be associated with primary palmar hyperhidrosis. Certain diseases and medications can also cause secondary hand sweating.
What can hand sweating be a sign of?
Excessive hand sweating is not always a sign of another disease. However, thyroid diseases, changes in blood sugar, certain infections, hormonal or neurological conditions, and certain medications can increase sweating. Sweating that is new, one-sided, or continues at night is evaluated separately.
How can hand sweating be stopped?
There is no single method that is right for everyone with hand sweating. Depending on the severity, antiperspirants, iontophoresis, certain topical or oral medications, and botulinum toxin may be considered. ETS may be considered in selected severe cases of primary palmar hyperhidrosis when appropriate non-surgical methods have not been sufficient.
What helps with hand sweating?
Drying the hands when needed and identifying personal triggers that increase sweating can make daily life easier. For primary palmar hyperhidrosis itself, non-surgical methods such as antiperspirants and iontophoresis may be considered. The appropriate approach depends on the cause and severity of the sweating.
Which doctor should I see for hand sweating?
Focal palmar hyperhidrosis can be evaluated by a dermatologist. If the sweating begins suddenly, affects the whole body, or occurs together with other symptoms, evaluation by internal medicine, endocrinology, neurology, or other relevant specialties may be needed. Evaluation by thoracic surgery generally comes into play when a surgical option is being considered in selected severe cases of primary palmar hyperhidrosis.
Is hand sweating psychological?
Primary palmar hyperhidrosis is not purely a psychological problem. It is a physical condition associated with excessive stimulation of the sweat glands by the sympathetic nervous system. However, stress, excitement, and anxiety can increase sympathetic nervous system activity and make sweating more noticeable.
Why do hands get cold and sweaty?
While increasing the activity of the sweat glands, the sympathetic nervous system can also affect the diameter of the blood vessels in the hands. For this reason, some people may have sweating while their hands feel cold. If there is persistent one-sided coldness, marked color change, pain, or numbness, circulatory or neurological causes are also evaluated.
Does iontophoresis work for hand sweating?
Iontophoresis is one of the main non-surgical methods used for primary palmar hyperhidrosis. The hands are placed in trays containing water, and a low-level electrical current is applied. To maintain its effectiveness, repeat sessions at regular intervals are usually needed after the initial treatment.
Does botulinum toxin reduce hand sweating?
Botulinum toxin can limit sweat production in palmar hyperhidrosis by temporarily reducing the nerve signals that stimulate the sweat glands. Its effect is not permanent. Injections in the palm may cause side effects such as pain and a temporary reduction in grip strength.
Does compensatory sweating occur after ETS surgery?
After endoscopic thoracic sympathetic surgery, new or increased sweating may develop on the back, chest, abdomen, lower back, groin, or legs. This is called compensatory sweating. Its severity varies from person to person, and there is no reliable test that can show with certainty before surgery who will develop it and to what degree.
Disclaimer: The information on this website has been prepared to inform the public about health topics. The content is not intended to provide a personal diagnosis, recommend a specific treatment, or replace a medical examination. Diagnostic and treatment approaches may vary depending on the individual's clinical findings and overall health. Please consult your physician about your personal health condition.

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