Does Caffeine Make You Sweat? What Studies Show

Caffeine can increase sweating in some settings, but not consistently#

Controlled studies give a qualified answer: caffeine has increased sweating sensitivity or whole-body sweat rate in some small exercise experiments, while another randomized trial found no difference in whole-body sweat loss. These studies used body-weight-based doses during exercise or heat exposure, not ordinary daily life in people with hyperhidrosis.[1][2][3]

So “caffeine makes everyone sweat” is not supported. Neither is “caffeine never affects sweat.” The effect appears to depend on dose, heat, exercise, and caffeine habituation.

Three studies point in different directions#

A 13-person crossover study found earlier and greater localized sweating#

Thirteen trained young men completed a randomized crossover exercise experiment after caffeine at 3 mg per kilogram of body weight. Caffeine shortened the time to localized sweating and increased localized sweat volume, sweat-gland output, and active sweat-gland density during a 30-minute run.[1]

This is direct evidence that caffeine can change sweating under that protocol. It is also a very small, male, athletic sample. It does not establish what happens after one cup of coffee at a desk or in someone with primary focal hyperhidrosis.

A 28-person trial found no change in whole-body sweat loss#

In a double-blind randomized crossover study, 28 adults exercised for an hour in moderate heat after 5 mg/kg caffeine or placebo. Caffeine changed some temperature and skin-blood-flow responses in habitual caffeine users, but whole-body sweat loss did not differ in either habitual or nonhabitual groups.[2]

This result shows why a single mechanism cannot answer the reader's question. Caffeine can affect thermoregulation without necessarily increasing the total amount of sweat under every condition.

A 12-person hot-cycling study found a higher sweat rate#

A 2024 double-blind crossover trial studied 12 caffeine-habituated men cycling in 35°C heat after 5 mg/kg caffeine or placebo. Caffeine increased heat production and whole-body sweat rate in that protocol, while not improving time to exhaustion.[3]

Again, the context was strenuous exercise in heat with a relatively high body-weight-based dose. It supports a possible effect, not a universal everyday prediction.

Caffeine does not equal hyperhidrosis#

Hyperhidrosis is excessive sweating beyond what is needed for thermoregulation. Primary focal hyperhidrosis has a characteristic recurrent, bilateral pattern at the underarms, palms, soles, or face and is typically absent during sleep.[4] A temporary response to coffee, an energy drink, heat, or exercise does not by itself establish that diagnosis.

Conversely, a personal caffeine trigger can coexist with primary focal hyperhidrosis. Removing a trigger may change symptom burden without changing the underlying diagnosis.

If the sweating pattern itself is unclear, start with the primary-versus-secondary hyperhidrosis distinction instead of extending the list of possible food and drink triggers.

How to test a personal pattern without overclaiming#

A short, structured observation can be more informative than relying on memory. Keep the time of day, activity, heat, clothing, stress, and approximate caffeine source reasonably consistent, then note when sweating starts, which body sites are affected, and how much it interferes. Avoid changing several likely triggers at once if the goal is to learn which one matters.

That is not a diagnostic test. Caffeine withdrawal can cause headache and other symptoms, and people with medical conditions, pregnancy, or medication concerns should discuss substantial intake changes with a clinician. The studies above do not define a treatment dose, a safe dose, or a required abstinence period.

When sweating deserves a broader assessment#

Seek medical evaluation when sweating is new, generalized, one-sided, prominent during sleep, associated with another symptom, or temporally linked to a medication change. Those patterns fit primary focal hyperhidrosis less well and may require a secondary-cause review.[4]

Frequently asked questions#

Does coffee make hyperhidrosis worse?#

It may be a trigger for some people, but the controlled studies did not enroll a representative hyperhidrosis population and do not prove a universal effect.[1][2][3] A consistent personal pattern is more informative than a blanket rule.

Is the effect caused by hot coffee or caffeine?#

Both beverage temperature and caffeine could matter in real life. The cited experiments isolated caffeine with controlled exercise and environmental conditions; they do not answer every hot-versus-cold beverage comparison.

Will stopping caffeine cure excessive sweating?#

There is no evidence that caffeine avoidance cures primary focal hyperhidrosis. It may reduce one trigger in a person who notices a reproducible association.

Do energy drinks count?#

They can contain caffeine plus other ingredients, and amounts vary. Check the label; do not assume that every drink or serving matches the doses used in a study.

Bottom line#

Caffeine can increase localized sweating sensitivity or whole-body sweat rate in some exercise-and-heat studies, but another controlled trial found no increase in total sweat loss.[1][2][3] The evidence is small, context-specific, and not proof that caffeine causes hyperhidrosis. Treat caffeine as a possible individual trigger, not a diagnosis or universal explanation.

This article provides general education and cannot evaluate a personal sweating pattern.

References#

1. Kim TW, Shin YO, Lee JB, Min YK, Yang HM. Caffeine increases sweating sensitivity via changes in sudomotor activity during physical loading. J Med Food. 2011;14(11):1448-1455. PubMed PMID 21883004

2. Hunt LA, Hospers L, Smallcombe JW, Mavros Y, Jay O. Caffeine alters thermoregulatory responses to exercise in the heat only in caffeine-habituated individuals: a double-blind placebo-controlled trial. J Appl Physiol. 2021. PubMed PMID 34435513

3. John K, Kathuria S, Peel J, et al. Caffeine ingestion compromises thermoregulation and does not improve cycling time to exhaustion in the heat among males. Eur J Appl Physiol. 2024. PubMed PMID 38568259 and PMC full text

4. Hornberger J, Grimes K, Naumann M, et al. Recognition, diagnosis, and treatment of primary focal hyperhidrosis. J Am Acad Dermatol. 2004. PubMed PMID 15280848