Excessive Sweating and Hormones

Sweating is the body's main way of cooling itself, but for some people it feels excessive, unpredictable, or out of proportion to the temperature or activity. Because several hormonal conditions can raise the body's metabolic pace or disturb temperature control, sweating is sometimes a useful clue. This page explains the possible links and why a clinician's assessment matters more than self-diagnosis.

How sweating can relate to hormones

Sweat glands are controlled by the nervous system, which in turn responds to body temperature, emotion, and chemical messengers. Hormones influence how much heat the body produces and how reactive the sweating response becomes. When hormone levels shift, temperature regulation can become more sensitive, so ordinary warmth or stress triggers more sweating than expected.

Thyroid hormones set the body's overall metabolic rate, and an excess tends to make people feel hot and sweaty. Changes in sex hormones around menopause can disturb the brain's temperature control, producing flushing and night sweats. Stress hormones and low blood sugar can also bring on sudden sweating. Because so many ordinary situations cause sweating, the symptom is best understood as a clue rather than a diagnosis.

Which hormones and conditions may be involved

Many factors can contribute. None can be diagnosed from the symptom alone, but a clinician may consider:

• Thyroid hormones. An overactive thyroid commonly causes heat intolerance and increased sweating, often with a fast heartbeat.
• The menopause transition. Changing oestrogen levels can cause hot flashes and night sweats.
• Blood sugar. Low blood sugar can trigger sudden sweating, shakiness, and a clammy feeling.
• Stress hormones. Anxiety and the body's stress response can cause sweating, particularly on the palms, face, and underarms.
• Rare adrenal tumours. Uncommon tumours that release stress hormones can cause episodes of sweating, palpitations, and high blood pressure, which a clinician would consider only in specific situations.

Non-hormonal causes to keep in mind

Not all heavy sweating is hormonal. Many people have primary hyperhidrosis, where the palms, soles, underarms, or face sweat excessively without an underlying disease. Hot environments, exercise, fever, infections, spicy food, alcohol, caffeine, anxiety, obesity, and certain medicines can all increase sweating. Persistent night sweats that soak through bedding, especially with weight loss or feeling unwell, deserve medical attention because they can occasionally signal other conditions. Because everyday explanations are so common, a careful history usually comes first.

Tests a clinician might consider

Assessment usually begins with the pattern of sweating, where on the body it occurs, when it started, and any other symptoms, along with an examination. Depending on the findings, a clinician might consider:

• Thyroid tests such as TSH if an overactive thyroid is suspected.
• Blood glucose when sweating episodes suggest low blood sugar.
• Sex-hormone assessment in specific situations around the menopause transition, interpreted carefully because levels fluctuate.
• General tests when sweating is persistent and unexplained, particularly with weight loss or fevers.

You can read more about individual tests in our blood tests section and about the messengers themselves in the hormones section. Related conditions are covered in the conditions section, and other symptoms are listed in the symptoms section. See also heart palpitations.

When to see a clinician

It is reasonable to seek medical advice when sweating is sudden in onset, one-sided, disrupts daily life, or comes with other symptoms such as weight loss, a fast heartbeat, fevers, or feeling generally unwell. Drenching night sweats that persist deserve assessment. A clinician can take a history, examine you, arrange any appropriate tests, and discuss options for managing bothersome sweating. This page is educational and is not a substitute for personalised medical advice.