Night sweats: causes, medications & when to see a doctor

You wake up in the middle of the night, the pillow is wet, the T-shirt soaked through – and that despite the heating not running at full blast. Night sweats are not just unpleasant but can be a signal from your body that something is wrong. The causes range from harmless factors such as a bedroom that is too warm to medication side effects or conditions that require treatment. Here you will learn how to interpret your night sweats, which medications come into question as triggers and when you should see a doctor.

1. What you can do right now

2. Understanding night sweats – what is normal, what is not?

Sweating at night is not automatically night sweats in the medical sense. If you wake up only slightly damp because the duvet is too warm, that is normal. It becomes medically relevant when you regularly sweat so much that you have to change your nightwear and the bedding – despite an appropriate sleeping temperature.

Doctors distinguish three degrees of severity:

From degree 2 onwards, you should have the cause assessed by a doctor – especially if it happens regularly.

3. Common causes of night sweats

3.1 Medications – a frequently overlooked trigger

Many active ingredients can cause night sweats as a side effect. According to one study, 5–14 % of people who take antidepressants suffer from nocturnal hyperhidrosis. Particularly affected are:

3.2 Hormonal fluctuations & the menopause

The menopause (perimenopause) is the best-known hormonal cause of night sweats – up to 75 % of women are affected. Falling oestrogen levels throw the temperature regulation centre in the hypothalamus into confusion: the body "believes" it is overheated and reacts with sweating. An overactive thyroid, hormonal fluctuations in the cycle or an overdose of levothyroxine can also cause night sweats.

3.3 Infections

Colds, flu and other feverish infections often trigger night-time sweating – this kind of night sweats usually disappears after 3–7 days. Chronic infections (e.g. tuberculosis, HIV) and bacterial inflammation of the inner lining of the heart (endocarditis) can also cause night sweats.

3.4 Stress and anxiety disorders

Psychological stress activates the sympathetic nervous system. The body reacts with sweating, palpitations and restlessness even in sleep. Chronic stress can lead to persistent night-time sweating.

3.5 Alcohol and diet

Alcohol widens the blood vessels and disturbs temperature regulation. Spicy food can have the same effect. Heavy alcohol consumption in the evening is one of the most common harmless causes of night sweats.

4. What helps against night sweats?

Optimise the sleep environment

Cool the bedroom to 16–18 °C, use breathable bedding made of cotton or linen, avoid synthetic duvets and pillows. Keep a second set of bedding within reach so that you can change quickly with heavy sweating.

Adjust your lifestyle

No alcohol, no spicy food, no heavy meals in the evening. Avoid caffeine after 2 pm. A short relaxation exercise before sleeping (progressive muscle relaxation or the 4-7-8 breathing technique) can reduce stress-related sweating.

Home remedies

Sage tea (2–3 cups a day) is considered a traditional remedy against excessive sweating – sage leaves contain essential oils that inhibit the sweat glands. Lavender oil on the pillow can have a calming effect and promote falling and staying asleep.

With a medication cause

Never stop medications on your own. Speak to your doctor – often a change of the intake time helps (e.g. prednisolone in the morning instead of the evening), a dose adjustment or a switch to an alternative preparation.

5. Is it down to your medication?

If the night sweats began at the same time as a new prescription or a dose increase, you should check your medication.

6. When should you have night sweats assessed?

Occasional sweating at night is mostly harmless. See a doctor if:

• The night sweats have occurred regularly for more than 2–3 weeks.
• You notice unexplained weight loss (more than 5 % in 6 months).
• Fever without a recognisable infection is added.
• Swollen lymph nodes are palpable.
• You feel extremely run down and exhausted during the day → tiredness.
• The night sweats coincide in time with a new medication.

7. Preparing for the doctor's appointment – your checklist

So that your doctor finds the cause quickly, prepare this information:

• Since when? When exactly did the night sweats begin?
• How severe? Do you have to change bedding or clothing? (Degree 1/2/3?)
• Accompanying symptoms: fever, weight loss, tiredness, pain?
• Medications: a complete list – over-the-counter remedies and vitamins too.
• Changes: new medications, a dose change, stopping?
• Lifestyle: alcohol consumption, stress level, diet?

How brite supports you in keeping an overview

brite brings structure into your observation and helps you to find the cause of your night sweats.

• Digital medication plan – all preparations at a glance, so that your doctor can identify medication-related causes immediately. To the medication plan
• Interaction check – checks whether your medication combination intensifies the night sweats. Check now
• Intake reminder – stable routines prevent rebound effects that trigger sweating. Set up a reminder

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