Waking with damp hair after a warm night is normal. Waking with clothing and bedding soaked, repeatedly, is a symptom worth one conversation with a doctor. In the largest review of the primary care evidence on night sweats (Mold, Holtzclaw and McCarthy, Journal of the American Board of Family Medicine, 2012), most people reporting night sweats had no serious cause found. But the same review lists the causes that must not be missed, and the pattern of your sweating is what separates them.
A phone consultation is £59 and usually settles the next step in one call. A video consultation is from £150, and first-line blood tests can be arranged the same day.
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The common, benign causes
Environment comes first: a warm bedroom, heavy duvets and a partner who sleeps hot account for a large share of "night sweats" that are not sweats of illness at all. Alcohol in the evening is a potent and under-recognised trigger. Stress and anxiety raise night-time autonomic activity and sweating. Medicines are a frequent cause, with antidepressants (particularly SSRIs) the classic offender in the 2012 review, alongside some painkillers and hormonal treatments. In women in their forties, fluctuating oestrogen through perimenopause is one of the most common causes of true night sweats, often before periods change.
The causes that must not be missed
Infection. Tuberculosis and HIV both classically cause drenching night sweats, and both are testable. Endocarditis and deep abscesses cause sweats with fever.
Cancer. Lymphoma is the malignancy most associated with drenching sweats, typically with weight loss, fatigue or a persistent lump. NICE guidance (NG12) includes these "B symptoms" in referral criteria.
Endocrine. An overactive thyroid causes sweating with palpitations and weight loss. Low blood sugar overnight affects some people on insulin.
The point of the consultation is to place your pattern on this map quickly, because most patterns land on the benign side and the ones that do not are testable.
What testing looks like
Where the history and examination suggest a cause that needs excluding, first-line tests are simple: a full blood count, inflammatory markers (ESR or CRP), thyroid function, and glucose. Infection screens (including HIV and TB testing) are added where the history points that way. Most people get a clear answer from this panel plus the consultation itself. Imaging is reserved for the few whose results or examination keep the question open.
WhatsApp us how long it has been happening and any other symptoms | or call 020 3951 3429
Free checklist: what to track for one week before your appointment
How many nights a week, and how severe: damp hair, wet top, or soaked bedding.
Evening alcohol, and whether sweat-free nights follow dry evenings.
Temperature taken at 3am during a sweaty night, if you can.
Weight trend over two months without dieting.
New or changed medicines in the last three months, including antidepressants.
Any lumps, persistent cough, or fevers by day.
When it is not us
Night sweats with a fever that will not settle, drenching sweats with a new persistent lump, or sweats with significant unexplained weight loss need prompt in-person assessment, and where an urgent pathway is right we arrange it the same day. Night sweats with chest pain or severe breathlessness are emergency care, not an appointment.
Ready when you are: WhatsApp, call 020 3951 3429, or email team@thewellnesslondon.com
Frequently asked questions
Q: Are night sweats a sign of something serious?
A: Usually not. In the 2012 systematic review by Mold and colleagues, most people reporting night sweats in primary care had no serious cause identified. The pattern matters: drenching sweats with weight loss, fever or a persistent lump need prompt assessment.
Q: Can antidepressants cause night sweats?
A: Yes. SSRIs and several other medicines are a well-documented cause in the 2012 review. Never stop a prescribed medicine because of sweating; mention it at the consultation and alternatives can be weighed.
Q: What tests will I need?
A: Most people who need testing start with a full blood count, inflammatory markers, thyroid function and glucose, arranged the same day. Infection screens are added where the history suggests them.
Q: Can perimenopause cause night sweats before periods change?
A: Yes. Fluctuating oestrogen commonly causes night sweats in the forties, sometimes years before periods alter. It is one of the most common causes we see, and it is manageable.
References
Mold JW, Holtzclaw BJ, McCarthy L. Night sweats: a systematic review of the literature. Journal of the American Board of Family Medicine, 2012.
NICE Guideline NG12. Suspected cancer: recognition and referral. 2015, updated.
Reviewed by The Wellness Clinical Team. Last updated 18 October 2026.