Sweating excessive in children

Overview

Excessive sweating in children, also called hyperhidrosis, means a child sweats much more than needed to cool the body. It can happen all over or only in certain areas like the hands, feet, or armpits.

About 1 in 100 children have excessive sweating. It is more common in teenagers and often runs in families.

It can affect children of any age, but it often starts before age 16. Both boys and girls can be affected.

Symptoms

Common symptoms

• Sweating that is much more than other children the same age
• Sweating that happens even when the child is not hot or active
• Wet hands, feet, armpits, or face that can be seen or felt
• Sweat that soaks through clothes

Symptoms in children

• Children may have sweating that interferes with writing, drawing, or playing
• They might feel embarrassed or avoid social activities
• Sweating often happens at night or during sleep in some cases

Symptoms in older adults

• In older adults, sudden excessive sweating can be a sign of other health issues, but in children this is less common. Older adults should see a doctor if they have new onset sweating.

Causes

Main causes

• Primary hyperhidrosis – overactive sweat glands for no clear reason, often starts in childhood
• Secondary hyperhidrosis – caused by another condition like an infection, fever, overactive thyroid, or certain medicines

Risk factors

• Family history of excessive sweating
• Being overweight or obese
• Certain medical conditions, such as diabetes or an overactive thyroid
• Living in a hot or humid climate

When to see a doctor

See a doctor urgently if:

• If the child has excessive sweating with a high fever, rapid heart rate, or seems very dehydrated

Book a routine appointment if:

• If sweating is frequent, heavy, or starting to bother the child socially or at school
• If the child has night sweats without a fever
• If you are worried about an underlying health cause

Diagnosis

A doctor will ask about the child's medical history and do a physical exam. They may ask about when sweating happens and if it runs in the family.

Tests that may be done

• Sweat test – a starch-iodine test to see which areas sweat the most
• Blood tests to check for thyroid problems, infections, or other conditions

What to expect at your appointment

The doctor may also ask about any medicines the child takes. Most tests are simple and painless. The doctor will explain what they are looking for.

Treatment

Treatment depends on the cause and how much the sweating affects the child's life. Many treatments can help reduce sweating.

Self-care at home

• Apply a strong antiperspirant (usually containing aluminium chloride) to the affected areas at night. Always follow the instructions.
• Keep the child cool – use fans, air conditioning, or cool showers.
• Dress the child in loose, light clothes made from natural fibres like cotton.
• Change socks and clothes often to keep skin dry.
• Avoid spicy foods and caffeine, which can trigger sweating.

Medical treatments

If self-care is not enough, a doctor may suggest prescription antiperspirants, iontophoresis (a device that uses mild electrical currents in water to reduce sweating), or oral medicines that help reduce sweating. In some cases, a doctor may recommend Botox injections to block sweat glands. These treatments are usually safe for children when done by a specialist.

When is surgery considered?

For very severe cases that do not respond to other treatments, surgery to remove sweat glands or cut the nerves that trigger sweating (sympathectomy) may be considered. This is rare in children and only after careful discussion with a specialist.

Living with this condition

Help the child develop a routine to manage sweating, such as applying antiperspirant at night and carrying a spare shirt. Encourage them to stay hydrated and take breaks if they feel overheated.

Lifestyle tips

• Use a small towel or handkerchief to dry hands and face.
• Choose shoes and socks that let feet breathe.
• Talk to the school about allowing the child to keep a water bottle and take cool-down breaks if needed.

Diet and exercise

Keep the child well hydrated. There is no special diet, but avoiding spicy foods and caffeine may help. Exercise is fine – just make sure the child drinks water and cools down afterwards.

Mental health and emotional wellbeing

Excessive sweating can make a child feel self-conscious or anxious. They may avoid sports or social events. Talk to them about their feelings and consider involving a school counsellor if needed.

Prevention

Primary hyperhidrosis cannot be prevented because it is linked to genetics. But you can help manage symptoms with lifestyle changes.

Vaccines

No vaccines are available for excessive sweating.

Screening programmes

There is no routine screening for hyperhidrosis. Talk to a doctor if you notice symptoms.

Complications

If left untreated

• Skin infections like athlete's foot or fungal rashes due to constant moisture
• Social and emotional problems, such as low self-esteem or avoiding friends
• Dehydration in extreme cases, especially if the child is not drinking enough

Long-term outlook

With proper management, most children with excessive sweating can live a normal, active life. Treatments are safe and effective. The condition often improves as the child grows older, especially after puberty.

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