15891 Anhidrosis Lack Of Sweat

Overview

Anhidrosis is when your body does not sweat enough or at all. Sweating is how your body cools down, so without it, you can overheat quickly. It can affect just one part of your body or your whole body.

Anhidrosis is considered rare. Many people do not notice it until they become overheated, so it may be underreported.

It can happen to anyone at any age, but people with certain conditions like diabetes, skin injuries, or those taking certain medicines are more likely to develop it.

Symptoms

Common symptoms

• Little or no sweating when it is hot or during exercise
• Feeling very hot and flushed
• Dizziness or light-headedness
• Muscle cramps or weakness
• A fast heartbeat

Symptoms in children

• A child who does not sweat but becomes irritable or tired in warm weather
• Hot, dry skin with no moisture
• Acting unusually sleepy or confused

Symptoms in older adults

• Being less tolerant to heat than before
• Confusion or feeling faint in warm environments
• Dry skin with little or no sweat

Causes

Main causes

• Skin damage from burns, injury, or infection that blocks sweat glands
• Nerve damage from conditions like diabetes, or from spinal cord injury
• Certain medicines that interfere with sweating
• Inherited conditions that affect sweat glands or the nervous system
• Dehydration, which can temporarily reduce sweat production

Risk factors

• Being older
• Working or exercising in hot environments
• Having diabetes or other nerve conditions
• Having skin conditions like psoriasis or scleroderma
• Taking medicines that affect the nervous system

When to see a doctor

See a doctor urgently if:

• You have symptoms of heat exhaustion, such as dizziness, nausea, or fainting
• You notice your body is not sweating at all during exercise or hot weather

Book a routine appointment if:

• You regularly feel overheated or sweat much less than before
• You have a medical condition that puts you at risk for nerve or skin damage

Diagnosis

Your doctor will ask about your symptoms, medical history, and any medicines you take. They will also do a physical exam and may refer you to a specialist.

Tests that may be done

• A sweat test, where a special powder or dye is placed on your skin to see how you sweat
• A skin biopsy, where a small piece of skin is examined under a microscope
• Blood tests to check for underlying conditions
• Nerve tests to see if nerve damage is causing the problem

What to expect at your appointment

The process may involve a few visits. Your doctor will work with you to understand the cause and create a plan to prevent overheating.

Treatment

Treatment for anhidrosis depends on the cause. There is no single cure, but the main goal is to prevent overheating and manage any underlying condition.

Self-care at home

• Avoid hot environments and direct sun during peak hours
• Drink plenty of cool fluids to stay hydrated
• Use fans, air conditioning, or cooling spray
• Wear light, loose clothing that lets your skin breathe
• Take cool showers or apply cool cloths to your skin

Medical treatments

If a medication is causing your anhidrosis, your doctor might adjust the dose or change the medicine. For skin or nerve conditions, treatments aim at the underlying disease. In some cases, therapies such as corticosteroid creams for skin conditions may help, but your doctor will recommend what is appropriate for you. There are no specific drugs approved only for anhidrosis.

When is surgery considered?

Surgery is rarely used for anhidrosis itself. If a treatable problem in a sweat gland or nerve is found, surgery might be considered, but this is not a common approach.

Living with this condition

Plan your daily activities for cooler times, like early morning or evening. Always have a way to cool down, such as carrying a water bottle and knowing where to find shade.

Lifestyle tips

• Check the weather forecast and heat warnings before going out
• Avoid heavy physical activity when it is very hot
• Tell your friends, family, and coworkers about your condition so they can help if you overheat
• Limit alcohol and caffeinated drinks, as they can make dehydration worse

Diet and exercise

Eat light, balanced meals and avoid heavy foods in hot weather. Exercise in a cool, well-ventilated place, drink water before, during, and after, and listen to your body — stop if you feel too hot.

Mental health and emotional wellbeing

Living with anhidrosis can make you feel anxious about going outside or being active. It is normal to worry. Talking with your healthcare team and finding ways to stay cool can help you feel more in control.

Prevention

You cannot always prevent the underlying causes, but you can prevent the main danger — overheating — by staying cool, drinking fluids, and avoiding very hot places.

Vaccines

There is no vaccine that prevents anhidrosis.

Screening programmes

There is no routine screening for anhidrosis. If you have risk factors, such as a condition that affects your nerves, talk to your doctor about how to monitor your sweating.

Complications

If left untreated

• Heat exhaustion, with symptoms like severe fatigue, dizziness, or nausea
• Heat stroke, which is a life-threatening medical emergency
• Organ damage from extreme body heat
• Loss of consciousness or seizures

Long-term outlook

With the right precautions, most people with anhidrosis can live active and safe lives. The outlook depends on the cause, but your doctor can help you manage the condition and reduce risks greatly.

Find support

International organisations

• International Hyperhidrosis Society ↗

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