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close up of someone in a grey t-shirt with sweaty underarms
By In-house Team, Circle Health Group

Why do I sweat so much

We unpack the mysteries of sweating – from its vital role in regulating our body temperature to potential causes of excessive sweating. Join us in understanding why some people sweat more than others and how to discern when it might be time to seek medical advice.

We've all been there: a tense meeting, a challenging workout, or a hot summer day and our body responds in that age-old way - by sweating. While sweating might seem inconvenient or even embarrassing at times, it's an essential function of our bodies. But what happens when you feel like you're sweating excessively? Is it something to worry about or simply part and parcel of being human? Let's dive into the world of perspiration and find out.

The science of sweating – the basics

Why do we sweat?

man with wet armpits why do I sweat so muchSweating, also known as perspiration, is the body's natural way of cooling down. Think of it as your body's built-in air conditioner. When you start to overheat, your nervous system prompts sweat glands to produce moisture, which then evaporates off your skin. This evaporation process helps regulate your body temperature, ensuring you don't get too hot. It's a marvel of human biology!

Not just heat, emotional stress, physical activity, or certain types of foods can also induce sweating. That's why you might find yourself with damp palms before a big presentation or after having a spicy meal.

How much sweating is normal?

Sweat is a natural response to various stimuli, but how do you gauge what's normal? On average, a person has over 2 million sweat glands in their body, and the amount they sweat can vary widely. Factors like genetics, body weight, and even fitness level can play a part.

Temperature and activity levels are major drivers. Naturally, you'll sweat more on a warm day or during a vigorous workout. But other factors, including hormones, emotions, and certain medications, can also come into play.

It's important to remember that everyone is unique. Some of us might sweat more because it's how our bodies are designed. However, if you feel you're sweating excessively and it's affecting your day-to-day life, it might be time to delve deeper and understand the reasons.

Remember, sweating plays a critical role in our body's functioning. While occasional excessive sweating might be uncomfortable, it's essential to understand the why behind it.

Excessive sweating, medically termed hyperhidrosis, is when the body sweats more than it needs to just to regulate your temperature.

What is considered excessive sweating?

While it's perfectly normal to break into a sweat during a morning run or in a stuffy room, how do you know when it's too much? Let's understand what truly classifies as excessive sweating.

Hyperhidrosis – beyond the norm

Excessive sweating, medically termed hyperhidrosis, is when the body sweats more than it needs to just to regulate your temperature. It's an issue that can lead to both physical discomfort and emotional distress.

Primary focal hyperhidrosis

This is localised sweating. It's not the result of other medical conditions or medications and tends to affect specific areas like the armpits, hands, and feet. If you find your palms being perpetually clammy or your shirts getting drenched without rigorous activity, this could be the reason.

Secondary hyperhidrosis

This is a bit different. This involves generalised excessive sweating and is typically caused by another medical condition or as a side effect of medications.

Why might you be sweating too much?

The reasons behind excessive sweating are diverse, spanning from medical conditions to dietary choices. Let's unpack these.

Medical conditions and sweating


Diabetes can influence the way you sweat. A person with low blood sugar (hypoglycaemia) might sweat profusely. Diabetic neuropathy, a condition where nerves get damaged due to high blood sugar, can also alter sweat patterns.

Hormone fluctuations

Swings in hormone levels, such as during pregnancy or menopause, can result in increased sweating. If you've ever heard of ‘hot flushes’ during menopause, this is precisely what we're talking about. Hormonal changes during menstruation can also lead to varying sweat levels for some women.

Thyroid issues

Your thyroid, a small gland in the neck, plays a big role in regulating metabolism. Disorders like hyperthyroidism (overactive thyroid) can rev up metabolism and result in excessive sweating.


Certain medications come with increased sweating as a side effect. This includes some antidepressants, pain relievers, and fever-reducing drugs. Always check the label and consult with your doctor if you notice such effects after starting a new medication.

Lifestyle and dietary factors that cause sweating

Weight and sweating

There's a common belief that increased body weight can lead to more sweating. While it's true that larger bodies may need to exert more energy in movement and therefore produce more heat, body composition and metabolism also play roles. So, while weight can influence sweating, it's just one of many factors.

Spicy foods

Love that extra kick in your curry? Well, spicy foods can indeed induce sweating. Capsaicin, the compound that gives peppers their heat, can trick your body into feeling hotter than it is, prompting those sweat glands into action.

Sweating is your body's way of communicating. Whether it's responding to a spicy meal or indicating a deeper medical concern, it's vital to listen and understand its signals. Now, let’s understand hyperhidrosis further and explore ways to manage and treat excessive sweating.

Living with excessive sweating can be more than just a minor inconvenience—it can affect your daily activities, confidence, and overall wellbeing.

Understanding and managing hyperhidrosis

Living with excessive sweating can be more than just a minor inconvenience—it can affect your daily activities, confidence, and overall wellbeing. Let’s explore how hyperhidrosis is diagnosed and the variety of treatments available.

Symptoms and diagnosis of hyperhidrosis

Hyperhidrosis isn't just about sweating a lot. If you find your clothes soaked even in cool temperatures, or if you avoid certain fabrics or colours because they show sweat too easily, you might be dealing with hyperhidrosis.

Identifying hyperhidrosis often requires a thorough medical examination and an understanding of your history. Doctors differentiate it from regular sweating by the sheer volume of sweat and its impact on daily life.

The nervous system triggers sweating, but in hyperhidrosis, the sweat glands go into overdrive. It’s like having a car accelerator that's stuck down—your body sweats even when it doesn't need to cool down.

Treatment options for excessive sweating

Botox Injections (Botulinum toxin)

Yes, the same Botox known for smoothing wrinkles can curb excessive sweating! When injected into areas like the armpits, Botox can block the nerves that activate sweat glands, resulting in decreased sweat production for months at a time.

Prescription-strength antiperspirants

Not your typical off-the-shelf antiperspirant, these contain aluminium chloride at a higher concentration. They work by blocking the sweat ducts, thereby reducing the amount of perspiration that reaches the skin. A doctor might recommend this as a first line of treatment.

Endoscopic thoracic sympathectomy

Endoscopic thoracic sympathectomy is a surgical procedure where certain nerves are cut or clamped to stop the overstimulation of sweat glands. While effective, it's generally considered only after other treatments have failed as a last resort.

Other treatments for excessive sweating

Emerging treatments, such as microwave therapy, which targets and eliminates sweat glands, or iontophoresis, where mild electrical currents prevent sweat from reaching the skin's surface, offer hope to those seeking relief. It's essential to discuss these options with a medical professional to determine the best option for your needs.

Day-to-day management of sweating

While medical treatments can help, incorporating some daily habits in the meantime can also make a big difference.

Dress smart

Wear loose-fitting clothes and opt for breathable fabrics like cotton. Layers can also help, as you can remove or add based on how you feel.

Maintain good personal hygiene

Regular showers and keeping the skin clean can help prevent infections, reduce odour, and make you feel fresher.

Stay hydrated

Drinking water can help keep body temperature in check, reducing the need to sweat excessively.

Are you sweating too much? Speak to a specialist today

Understanding why we sweat and when it's excessive is crucial for our well-being. Hyperhidrosis can be challenging, but with the right knowledge and support, it's manageable. Remember, if you're concerned about your sweating, it's essential to consult a medical professional.

Concerned about your sweat patterns? At Circle Health Group, we're here to help. Whether it's understanding if you have hyperhidrosis or finding the right treatment for you, our specialists are just a call away.

Don't let excessive sweating dictate your life. Book an appointment online today, or give us a call directly, and we'll guide you to the specialist that's right for you.


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If you're concerned about symptoms you're experiencing or require further information on this subject, talk to a GP or see an expert consultant at your local Circle Hospital.