Picture this: You’re 10 minutes into a Vinyasa yoga flow with a friend. Although you’ve only completed a single Sun Salutation, you can already feel your workout clothes absorbing a sizable amount of sweat. You glance at your friend and see that they’re just as dry as they were before stepping onto the mat. You’re doing the exact same activity with the same amount of effort—so why are you on opposite ends of the sweat spectrum?

It’s more than understandable (and all too relatable) if you find yourself wondering why you sweat so much when you work out. We spoke with board-certified cosmetic dermatologist Michele Green, MD, to get her expert insights on why some people experience excessive sweating during exercise—and if it’s totally normal or cause for concern. Plus: Read on to get the lowdown on the different types of sweat, how to curb excessive perspiration, and more.

Why Do I Sweat So Much When I Work Out?

To understand why you sweat so much during exercise, it first helps to understand why humans sweat in general. “During a workout, our heart rate and core body temperature increase,” Dr. Green says. “In response, our body stimulates sweat glands to perspire or produce sweat.” Soon enough, the sweat evaporates from your skin, thus releasing heat and effectively cooling your body down.

Perhaps you sweat a lot while working out, simply living your life, or both. There are a few common reasons why you naturally won’t stay as dry as you’d like—or why you always seem to generate what seems to be infinitely more moisture than your workout buddy does.

According to Dr. Green, key causes of profuse sweating include:

Sweating extra excessively may also point to a medical condition called hyperhidrosis. Dr. Green says this kind of sweating occurs independent of exercise, environmental factors like temperature and humidity, and conditions like stress. “With hyperhidrosis, sweat glands remain in a constant state of overactivity and produce more sweat than necessary to regulate body temperature,” she explains. 

People with hyperhidrosis have an oversensitive sympathetic nerve (which regulates sweating), triggering a deluge of sweat. Hyperhidrosis is categorized as primary or secondary, according to the National Library of Medicine (NLM):

Personal health factors aside, certain workouts can simply cause you to sweat more than others. Since the body generates sweat in order to help keep you cool, fitness modalities that seriously rev up your core temperature—think HIIT workouts, hot yoga, and the like—can lead you to sweat buckets (versus a droplet here and there).

The Different Types of Sweating

Did you know that there are actually three types of sweat? How about the fact that there are two types of sweat glands: eccrine glands and apocrine glands? If you need an intro lesson or a quick refresher, Dr. Green helpfully outlines key details below.

1. Thermoregulatory Sweating

Thermoregulatory sweating (the type most commonly at play while working out) cools the body to maintain a healthy core body temperature thanks to eccrine glands. “Thermoregulatory sweating typically originates around the scalp and forehead before moving to the face and rest of the body,” Dr. Green says. Such areas include but aren’t limited to the chest, underarms, and back.

2. Emotional Sweating

Emotional sweating (aka psychological sweating) occurs in response to stimuli like stress, fear, and pain. “Eccrine glands are also stimulated during emotional stress, with sweat typically developing in the palms, axillae [aka underarms], and soles,” Dr. Green says. Apocrine glands, which “can be found in the perianal and axilla regions and are commonly associated with more odorous sweat,” are involved in emotional sweating as well. That’s because these glands are stimulated by norepinephrine, a hormone that gets released in response to stress, she explains.

3. Gustatory Sweating

Gustatory sweating occurs in response to digesting hot or spicy foods. Gustatory sweating is common on the face and neck, notes the International Hyperhidrosis Society.

Is It Good to Sweat While Exercising?

Rest assured that sweating isn’t just natural; it’s good for you and beneficial for your physical fitness regimen. While you’re exercising, the primary purpose of sweat is to regulate your body temperature. Heat gets released and your body is able to cool down so you can safely and comfortably continue with your workout. 

When Sweat Becomes Excessive During a Workout

Sweating during exercise typically indicates that your body is doing exactly what it should. But in some cases, extreme sweating can signal that you’re losing fluids and electrolytes at a rapid rate, thus running the risk of dehydration and electrolyte imbalance. (Keep reading for the key symptoms to watch out for, as well as tips to keep your fluid and electrolyte counts in good shape.)

If you sweat excessively during exercise—or even from mild activity—you might be dealing with hyperhidrosis, which warrants medical attention.

Can I Prevent My Body from Sweating So Much During Exercise?

Although sweating is natural and nothing to be ashamed of, it can sometimes feel embarrassing—especially if you’re visibly drenched through your clothes.

To get ahead of intense sweat during a workout, you can:

Treatments for Excessive Sweating

Heeded all of the dietary and lifestyle interventions above and still can’t seem to stop the sweating? It may be smart to seek medical advice sooner rather than later.

“If left untreated, excessive sweating can cause maceration, or skin breakdown, leading to susceptibility to infection,” Dr. Green warns. “Consulting with a doctor is [ideal] to determine the best treatment for you.”

Fortunately, a variety of medical treatments are available that can curb intense sweating with success. To start, you can talk to your doctor about prescription antiperspirants. Some contain active ingredients that form a gel with sweat to block the production of more sweat, Dr. Green explains.

Next up on the list is anticholinergic medications, which block neurotransmitters called acetylcholine from transmitting signals between specific cells to decrease sweat production, Dr. Green explains. Topical anticholinergics block the receptors responsible for excessive sweating, while oral anticholinergics can be used off-label to decrease your overall sweating, she says.

Last but not least, you can consider Botox—yep, Botox—which gets Dr. Green’s enthusiastic stamp of approval for its efficacy to halt excessive sweating. “Botox contains botulinum toxin, a neurotoxin that inhibits nerves from signaling sweat glands, leading to a decrease in sweat production,” she explains. Your dermatologist can inject it into your underarms, palms, and/or feet if they deem it’s right for you. Just note that it’s not a permanent solution—it normally lasts six to 12 months, depending on the injection area and the body's metabolism, Dr. Green says.

As always, it’s important to start by talking with your doctor about which (if any) of these approaches might be right for you.

The Importance of Hydration When You’re Sweating

Staying hydrated is crucial—full stop. This rings true day in and day out, whether you’re logging a workout or not. No matter the cause, if you sweat a lot, you may run the risk of dehydration and electrolyte loss if you don’t stay on top of replenishment.

According to the NLM, you’ll want to watch out for dehydration symptoms including but not limited to:

To avoid these symptoms, be sure to drink water throughout the day—especially on days when you work out. (Bonus: Other beverages, as well as water-rich foods like produce and soups, also count towards your daily quota.) 

If and when you’re physically active, you should also take care to replenish your electrolytes. Some of the top dietary sources of electrolytes include baked potatoes, bananas, cottage cheese, pickles, and Greek yogurt.

What Does It Mean If You’re Barely Sweating at All?

Thus far, we’ve covered the ins and outs of sweating to extremes. But what about the opposite end of the spectrum? What if you’re not sweating at all or sweating only to a limited degree when it’s totally normal and expected to sweat? (Think: If you’ve logged an hour on the Peloton Tread and there’s nary a bead of sweat in sight.)

According to Dr. Green, you could be dealing with a condition called hypohidrosis. At first, you might think this would be a welcome substitute for sweating profusely—after all, many of us default to thinking the grass is always greener on the other side. However, lacking the ability to sweat isn’t without its risks.

“Hypohidrosis, or anhidrosis, is a medical condition where sweat glands have trouble producing sweat in one or more body areas,” Dr. Green explains. Mild cases may be barely perceptible, yet severe cases can end up being life-threatening, she cautions.

“Sweat is essential for cooling body temperature in situations, such as hot weather or physical activity,” Dr. Green reminds us. “Failure of the body to produce sweat in these situations can lead to heat cramps, heat exhaustion, and heatstroke.” Just as hyperhidrosis warrants medical intervention, so does hypohidrosis. Be sure to get ahead of either to keep your workouts and your body on track.

The Takeaway

Always questioned why you sweat so much when you work out? The root cause might be due to your genetics, having overactive sweat glands, your body’s size and temperature, or certain medical conditions. Moreover, a few lifestyle factors—and even your specific fitness modality of choice—could be causing you to heat up more than you would on a different day (and during a different workout).

That said, there are a few easy-to-adopt solutions that may help you feel less sweaty during a workout. Perhaps the hack that works for you is as simple as wearing the right workout clothes or adjusting your pre-exercise food intake. Otherwise, you might want to pay a visit to your doctor to discuss whether or not medical interventions could help stop excessive sweating. By following these tips, you can very well succeed in your quest to stay more dry, and once and for all swap your main focus from wetness to your workout.