Stress, not summer heat, is the main trigger for hyperhidrosis, studies show

As autumn arrives and temperatures cool, people living with hyperhidrosis find little relief — their struggle with excessive sweating continues regardless of the season.

A growing body of research suggests that the primary drivers of hyperhidrosis flare-ups are not rising temperatures but psychological factors such as everyday anxiety, stress and social interactions.

Hyperhidrosis is a condition in which the body produces abnormally large amounts of sweat beyond what is needed for temperature regulation. It tends to concentrate in specific areas — the palms, soles, armpits and face — and is marked by sensitivity not only to ambient heat but also to emotional triggers such as tension and stress.

Domestic research confirms that most patients experience greater symptom aggravation from emotional factors than from weather. A study analyzing 255 primary hyperhidrosis patients at Ajou University Hospital's Hyperhidrosis Center found that 95.2 percent identified "anxiety or stress" as a leading cause of worsening symptoms. Some 77.0 percent cited interpersonal relationships as a trigger.

By contrast, "heat" (52.4 percent) and "summer" (50.8 percent) — the factors most commonly assumed to be the culprits — were cited by only about half of respondents. Meanwhile, 87.9 percent of patients in the study said excessive sweating persistently interfered with their daily lives.

International clinical research also points to the limited role of seasons. A 2024 study by a Turkish research team assessing disease severity in 104 patients with axillary hyperhidrosis found that 51 percent reported no change in the amount they sweat across different seasons.

This is because high-stress social situations — job interviews, work presentations, meetings — occur year-round. Anxiety about visible symptoms, such as sweaty handshakes or sweat stains on clothing, can itself trigger further sweating, creating a vicious cycle.

A large-scale 2016 study of 2,017 dermatology outpatients found that hyperhidrosis patients had rates of anxiety (21.3 percent) and depression (27.2 percent) roughly three times higher than those of other patients (7.5 percent and 9.7 percent, respectively), underscoring the condition's close link to psychological burden.

Taken together, these findings make it difficult to explain hyperhidrosis through temperature or season alone. While some patients do experience worse symptoms in summer or hot environments, many continue to suffer from excessive sweating in the hands, feet and armpits even after the weather cools.

When sweating causes ongoing difficulties in social relationships, studies or work, patients should look beyond blaming personal constitution or the time of year, and instead assess how frequently symptoms occur and how significantly they affect daily functioning. Because the affected areas, severity and triggering situations vary from person to person, seasonal changes alone are a poor measure of the condition's impact.

Specialists advise that patients who continue to experience discomfort from sweating after the weather cools should seek professional treatment rather than dismissing the condition as a matter of body type.

Treatment options for hyperhidrosis vary by affected area and severity and can be applied in stages. They include topical agents, botulinum toxin injections, iontophoresis and sympathectomy.

Also notable is the introduction in January this year of the country's first prescription topical medication approved for primary axillary hyperhidrosis, which has broadened non-surgical treatment options considerably.

Anyone who repeatedly experiences functional impairment or psychological distress from sweating in daily life — whether at school, work or in social settings — regardless of the season, is advised to consult a doctor and pursue medical treatment tailored to the location and severity of their symptoms.