Sweating helps regulate your body temperature, so it’s completely normal to sweat during exercise, on a hot day, or when you have a fever. But if you’re sweating much more than usual, or your sweating patterns have suddenly changed, you may be wondering what’s causing it.
In many cases, excessive sweating isn’t a sign of a serious health problem. It may be related to genetics, medications, hormones, or environmental factors. Sometimes, however, it can point to an underlying medical condition that should be evaluated by a healthcare provider.
Quick answer: The most common causes of excessive sweating include hyperhidrosis, certain medications, menopause, pregnancy, infections, hyperthyroidism, diabetes, anxiety, and obesity. Sudden or severe sweating, especially when accompanied by other symptoms, should be evaluated by a healthcare professional.
What is excessive sweating?
Everyone sweats differently, but excessive sweating goes beyond what’s needed to cool your body.
The most common form is called hyperhidrosis, a condition that causes sweat glands to become overactive. People with hyperhidrosis often sweat even when they aren’t exercising or exposed to heat.
According to the American Academy of Dermatology, hyperhidrosis commonly affects the hands, feet, underarms, and face, and can interfere with everyday activities and quality of life.
What causes excessive sweating?
Excessive sweating doesn’t have a single cause.
Instead, excessive sweating can result from several different factors.
1. Hyperhidrosis
Primary hyperhidrosis is one of the most common causes of excessive sweating.
This condition typically affects specific areas of the body, including:
- Underarms
- Palms
- Soles of the feet
- Face
Although experts don’t fully understand why it occurs, it often runs in families and usually isn’t caused by another medical condition.
2. Medications
Some prescription medications list increased sweating as a side effect.
These may include:
- Certain antidepressants
- Some diabetes medications
- Opioids
- Medications that affect hormones
- Some blood pressure medications
If you’ve recently started a new medication and notice excessive sweating, talk with the prescribing healthcare provider before stopping it on your own.
3. Hormonal changes
Hormonal fluctuations commonly affect body temperature.
You may notice increased sweating during:
- Menopause
- Pregnancy
- Puberty
Hot flashes associated with menopause often trigger sudden episodes of sweating that may occur during the day or at night.
4. Infections
Your body often produces sweat when fighting an infection.
Common examples include:
- Influenza
- COVID-19
- Pneumonia
- Other viral or bacterial illnesses
Sweating related to an infection usually occurs alongside symptoms such as fever, chills, fatigue, or body aches.
5. Hyperthyroidism
An overactive thyroid speeds up many of the body’s normal processes.
In addition to excessive sweating, symptoms may include:
- Weight loss
- Rapid heartbeat
- Tremors
- Anxiety
- Heat intolerance
The National Institute of Diabetes and Digestive and Kidney Diseases lists increased sweating among the common symptoms of hyperthyroidism.
6. Diabetes
People with diabetes may experience excessive sweating for several reasons, including episodes of low blood sugar or nerve damage that affects sweat glands.
If excessive sweating occurs alongside shakiness, confusion, dizziness, or weakness, seek medical attention promptly.
7. Anxiety and stress
Stress activates the body’s “fight-or-flight” response.
As a result, some people notice sweating during stressful situations, public speaking, or periods of heightened anxiety.
Stress-related sweating often affects the palms, underarms, and face.
8. Obesity
Carrying additional body weight can make it harder for the body to regulate temperature.
This doesn’t necessarily mean something is wrong, but people with larger bodies may notice they sweat more during everyday activities or in warm environments.
9. Certain foods and drinks
Some foods and beverages can temporarily increase sweating.
Examples include:
- Alcohol
- Spicy foods
- Caffeine
These effects are usually short-lived and vary from person to person.
10. Rare medical conditions
Less commonly, excessive sweating may be associated with certain neurological disorders, endocrine conditions, or cancers such as lymphoma.
These conditions usually cause additional symptoms beyond sweating alone.
Why does my sweat smell stronger than usual?
Sweat itself is mostly odorless.
Body odor develops when sweat mixes with bacteria that naturally live on the skin.
You may notice stronger odor if you:
- Sweat more than usual
- Exercise frequently
- Wear tight clothing
- Eat certain foods
- Don’t change out of damp clothing promptly
Good hygiene, breathable clothing, and antiperspirants can often help reduce odor.
When should you see a doctor about excessive sweating?
Occasional heavy sweating isn’t usually cause for concern.
Schedule an appointment if excessive sweating:
- Interferes with daily activities
- Starts suddenly without an obvious cause
- Wakes you from sleep regularly
- Occurs alongside unexplained weight loss
- Happens with chest pain, dizziness, or shortness of breath
- Doesn’t improve with over-the-counter treatments
A healthcare provider can determine whether your symptoms are caused by hyperhidrosis, medication side effects, or another medical condition.
How is excessive sweating treated?
Treatment depends on the underlying cause.
Options may include:
- Prescription-strength antiperspirants
- Oral medications
- Botox injections
- Treatment for an underlying medical condition
- Lifestyle changes
- In some cases, medical procedures
A dermatologist or primary care provider can help determine which approach is most appropriate.
The International Hyperhidrosis Society offers additional information about available treatments.
The bottom line
Sweating is a normal and healthy way for your body to regulate temperature. But if you’re sweating much more than usual, or your symptoms have changed, it’s worth paying attention.
Most causes of excessive sweating are manageable, especially when identified early. If heavy sweating is affecting your daily life or occurs alongside other concerning symptoms, talk with a healthcare provider to determine the underlying cause and the best treatment options.
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Frequently asked questions
What is the most common cause of excessive sweating?
Primary hyperhidrosis is one of the most common causes. This condition causes overactive sweat glands without an underlying medical cause.
Can excessive sweating be caused by stress?
Yes. Stress and anxiety activate the body’s fight-or-flight response, which commonly increases sweating, especially on the palms, face, and underarms.
Can medications cause excessive sweating?
Yes. Several medications, including some antidepressants, diabetes medications, and blood pressure medications, may increase sweating as a side effect.
When should I worry about excessive sweating?
See a healthcare provider if sweating begins suddenly, disrupts your daily life, regularly occurs during sleep, or is accompanied by symptoms such as chest pain, unexplained weight loss, fever, or shortness of breath.
Which doctor treats excessive sweating?
Many people begin with a primary care provider. Depending on the cause, you may also be referred to a dermatologist or another specialist.
The information in this article is provided for general informational purposes only and should not be relied on as medical advice. It is not intended as, and Zocdoc does not provide, medical advice, diagnosis or treatment. Zocdoc does not recommend any specific provider. Find one you’ll love on Zocdoc today.