Night Sweats: Causes and How to Ease Them
By Dr (TCM) Attilio D'Alberto | Traditional Chinese Medicine Practitioner, Wokingham
Night sweats — waking drenched, often having to change your nightclothes or sheets — have many possible causes. The most common is the menopause transition, but thyroid problems, low blood sugar, anxiety, infections and some medications can all be responsible, so it is worth understanding the pattern and getting persistent or unexplained sweats checked. In Chinese medicine night sweats are a classic sign of “empty heat” from Yin deficiency, and diet, lifestyle and Yin-nourishing herbs are used to cool and settle them.
Occasional overheating in a warm room is normal; true night sweats soak through nightwear and bedding regardless of the room temperature. This article covers the common causes, the warning signs that mean you should see a doctor, and both the practical and Chinese medicine approaches to easing them.
On this page
- What counts as night sweats
- Common causes
- Night sweats and the thyroid
- When to see a doctor
- The Chinese medicine view
- Diet and lifestyle that help
- Acupuncture and herbal support
- Frequently asked questions
1. What counts as night sweats
Night sweats are heavy sweating during sleep that soaks your nightclothes or bedding, beyond what the room temperature would explain. They are different from simply feeling too warm under a heavy duvet. People often wake suddenly, damp and sometimes chilled as the sweat cools.
They can happen on their own or as the night-time version of daytime hot flushes. Understanding the likely cause is the first step to easing them.
2. Common causes
There are many possible causes. The most common include:
- Menopause and perimenopause — by far the most common cause in women in their forties and fifties; see menopausal symptoms.
- Anxiety and stress — a heightened stress response can trigger sweating at night.
- Low blood sugar — especially in people on diabetes medication, or after alcohol.
- Thyroid overactivity — see the next section.
- Infections — from minor viral illness to, less commonly, more serious infection.
- Medications — some antidepressants, hormone treatments and others.
- Alcohol, caffeine and spicy food close to bedtime.
- In men, falling testosterone (the “andropause”) and other causes.
3. Night sweats and the thyroid
An overactive thyroid (hyperthyroidism) speeds up the metabolism and commonly causes heat intolerance, sweating and night sweats, often with a racing heart, weight loss despite a good appetite, anxiety, tremor and loose bowels. If night sweats come with these, ask your doctor for a simple thyroid blood test — see hyperthyroidism.
Thyroid problems are readily diagnosed and treated medically. Chinese medicine can support wellbeing alongside conventional thyroid treatment, but it is not a substitute for it. An underactive thyroid (hypothyroidism) more usually causes feeling cold, but disturbed temperature regulation can occur in either direction.
4. When to see a doctor
See your doctor if night sweats are frequent, persistent or unexplained, and promptly if they come with any of these “red flag” features, which need investigation:
- Unexplained weight loss
- Fevers, or feeling generally unwell
- Persistent cough, or swollen glands (lymph nodes)
- Unusual tiredness, bruising or bleeding
These features are uncommon, but because night sweats can occasionally signal infection or other conditions that need treatment, getting them checked is sensible. This article is educational and not a substitute for a medical assessment.
5. The Chinese medicine view
In Chinese medicine, night sweats are a classic sign of “empty heat” arising from Yin deficiency. Yin is the body’s cooling, moistening, calming aspect; when it becomes depleted — commonly with age, at menopause, after illness or from overwork — it can no longer restrain the body’s natural warmth, and heat “floats” out at night as sweating, often with a feeling of heat in the chest, palms and soles.
Less commonly, night sweats reflect Damp-Heat or a stronger “full heat” pattern. Matching the exact pattern is what guides treatment.
6. Diet and lifestyle that help
- Keep the bedroom cool, use breathable cotton nightwear and bedding, and layer so you can adjust.
- Avoid triggers near bedtime — alcohol, caffeine, spicy food and large late meals.
- Favour cooling, Yin-nourishing foods — pears, cucumber, tofu, mung beans, and plenty of fluids; go easy on very hot, spicy and greasy food.
- Manage stress and wind down before bed, since anxiety fuels sweating.
- Keep steady blood sugar with a balanced evening meal to avoid overnight dips.
7. Acupuncture and herbal support
Once medical causes have been considered, Chinese herbal medicine and acupuncture are used to nourish Yin and clear empty heat. Classic Yin-nourishing formulas such as Liu Wei Di Huang Wan are adapted to the individual, often with cooling herbs such as Di Gu Pi and Zhi Mu that specifically address heat and sweating.
Chinese herbal medicine is a complementary therapy and should be prescribed by a qualified practitioner, and used alongside — not instead of — medical care for any underlying cause. Online herbal consultations are available.
8. Frequently asked questions
What causes night sweats?
There are many possible causes. The most common is the menopause transition, but anxiety and stress, low blood sugar, an overactive thyroid, infections, and some medications can all cause them, as can alcohol, caffeine or spicy food near bedtime. In men, falling testosterone can contribute. Persistent or unexplained night sweats should be checked by a doctor.
When should I worry about night sweats?
See your doctor if night sweats are frequent, persistent or unexplained, and promptly if they come with unexplained weight loss, fevers, feeling generally unwell, a persistent cough, swollen glands, or unusual tiredness, bruising or bleeding. These features are uncommon but need investigation because night sweats can occasionally signal infection or other conditions that require treatment.
Are night sweats a sign of thyroid problems?
They can be. An overactive thyroid speeds up the metabolism and often causes heat intolerance, sweating and night sweats, usually with a racing heart, weight loss despite a good appetite, anxiety and tremor. A simple thyroid blood test from your doctor can check for this, and it is readily treated medically.
How does Chinese medicine explain night sweats?
In Chinese medicine night sweats are a classic sign of empty heat arising from Yin deficiency, where the body's cooling, moistening aspect becomes depleted, commonly with age, at menopause, after illness or from overwork, so heat floats out at night as sweating. Less commonly they reflect Damp-Heat or a stronger full-heat pattern. Treatment is matched to the exact pattern.
What can I do to stop night sweats naturally?
Keep the bedroom cool and use breathable cotton bedding, avoid alcohol, caffeine, spicy food and large late meals before bed, favour cooling foods, keep blood sugar steady with a balanced evening meal, and manage stress. Where a Chinese medicine pattern such as Yin deficiency is present, Yin-nourishing herbs and acupuncture can help, alongside treatment of any underlying medical cause.
