Skin Care Education

Excessive Sweating

A condition characterised by sweating significantly beyond what the body requires for temperature regulation. Also known medically as hyperhidrosis. Affects the underarms, hands, feet, and face.

What Is Excessive Sweating?

Excessive sweating, known medically as hyperhidrosis, is a condition in which the eccrine sweat glands produce significantly more sweat than is required for the body’s normal temperature regulation. Sweating is a physiologically essential process that plays a central role in cooling the body when temperature rises. In hyperhidrosis, this process is chronically overactivated, producing excessive perspiration that occurs independently of physical exertion, heat exposure, or emotional stimuli of an intensity that would produce significant sweating in unaffected individuals.

The condition is considerably more prevalent than is widely appreciated. Research estimates that between one and three percent of the global population experience hyperhidrosis to a clinically meaningful degree, though many more experience excessive sweating at a level that significantly affects their daily life and confidence without meeting formal clinical thresholds. Many people who live with the condition never seek professional advice, assuming it is simply an unavoidable personal characteristic rather than a recognised, treatable condition.

Hyperhidrosis most commonly affects specific focal areas of the body, particularly the underarms, palms of the hands, soles of the feet, and in some cases the face and scalp. It is socially disruptive in ways that extend well beyond the physical: it affects clothing choices, professional confidence, social interactions, and intimate relationships, and is associated with significant psychological burden in many of those who experience it.

Types of Excessive Sweating

Primary focal hyperhidrosis: excessive sweating affecting specific areas of the body, most commonly the underarms, palms, soles, and face or scalp, with no identifiable underlying medical cause. The most common form. Typically begins in adolescence or early adulthood, often has a hereditary component, and is thought to result from overactivity of the sympathetic nervous system signals to the sweat glands in affected areas.
Secondary generalised hyperhidrosis: excessive sweating that is caused by an underlying medical condition or is a side effect of medication. Tends to produce more widespread sweating rather than focal sweating in specific areas, and often begins in adulthood. The underlying cause requires identification and management.

Causes and Contributing Factors

Factor	Description
Overactive sympathetic nervous system signals	In primary focal hyperhidrosis, the nerve signals that stimulate sweat gland activity in the affected areas are disproportionately strong or frequent relative to the actual physiological need for cooling. The sweat glands themselves are structurally normal; it is the neural signalling to them that is dysregulated.
Genetics	Primary focal hyperhidrosis has a significant hereditary component. A positive family history is reported in a substantial proportion of those with the condition, suggesting a genetic predisposition to the dysregulated neural signalling that drives it.
Anxiety and emotional triggers	While anxiety does not cause primary hyperhidrosis, emotional stimuli that trigger the sympathetic nervous system reliably worsen sweating in those already affected. The self-consciousness and anticipatory anxiety that hyperhidrosis itself generates can create a feedback cycle in which the anxiety about sweating worsens the sweating.
Hormonal changes	Hormonal fluctuations, particularly during puberty, pregnancy, and menopause, can trigger or worsen excessive sweating. Hot flushes associated with menopause are a distinct but related phenomenon involving sympathetic nervous system activation.
Underlying medical conditions	Secondary hyperhidrosis can be caused by a range of conditions including hyperthyroidism, diabetes, certain infections, lymphoma, and neurological conditions. When excessive sweating is generalised, newly developed in adulthood, or accompanied by other symptoms, underlying causes warrant investigation.
Medications	A number of medications list excessive sweating as a known side effect, including certain antidepressants, opioids, some antihypertensives, and others. Medication-related hyperhidrosis is a form of secondary hyperhidrosis that typically resolves if the causative medication is discontinued or changed.
Dietary triggers	Certain foods and beverages, including spicy foods, alcohol, and caffeine, can trigger sweating through sympathetic nervous system activation. These are aggravating factors rather than causes of hyperhidrosis, but their avoidance can help manage the degree of sweating in affected individuals.

Frequently Asked Questions: Excessive Sweating

Yes. Primary focal hyperhidrosis is a recognised medical condition characterised by dysregulated sympathetic nervous system signalling to the sweat glands. It is not simply nervousness, a hygiene issue, or a personal failing. It is a physiological condition with identifiable characteristics, documented prevalence, and a range of clinically validated treatments. Secondary hyperhidrosis is also a medical concern in that it is caused by an underlying condition or medication that requires identification.

Primary focal hyperhidrosis has no identifiable underlying medical cause. It is the most common form, typically begins in adolescence, affects specific focal areas, and is thought to result from overactive sympathetic nerve signals to the sweat glands. Secondary generalised hyperhidrosis is caused by an identifiable underlying medical condition or medication. It tends to be more widespread in distribution, often begins in adulthood, and may be accompanied by other symptoms related to the underlying cause. Distinguishing between the two is important because the approach to management differs significantly.

Standard over-the-counter antiperspirants are formulated to reduce normal or moderate sweating by temporarily blocking sweat ducts with aluminium-based compounds. In hyperhidrosis, the volume and pressure of sweat produced in the affected areas is significantly greater than standard products are designed to manage. Clinical-strength or prescription antiperspirants with higher concentrations of active ingredient can be more effective, but even these may be insufficient for moderate to severe hyperhidrosis, which is why other approaches are available for those who require more significant reduction.

For some people with primary focal hyperhidrosis, the condition does improve naturally with age. Research suggests that a proportion of affected individuals notice a gradual reduction in severity from middle age onward, though this is not universal and the reasons for it are not fully understood. Many people continue to experience significant hyperhidrosis throughout their adult lives without natural improvement, making treatment a relevant consideration regardless of age.