Night sweats have several possible explanations and cannot be diagnosed from sweating alone. Heat, an infection, hormonal changes and medicines may be relevant. Recurrent heavy sweating deserves a primary care discussion, particularly when other symptoms are present.
Describe what actually happens
Feeling warm under a heavy duvet differs from needing to change soaked nightwear in a cool room. Record how often it happens and whether it is new. You do not need to identify the cause before seeking advice.
Mention fever, unintended weight loss, marked tiredness or palpitations. These details help your clinician select questions and investigations. An online list of possible diagnoses cannot identify which explanation applies to you.
A short night-time record
| Record | Example |
|---|---|
| Extent | Warm, damp or needing to change clothing and bedding? |
| Environment | Room temperature, duvet and whether someone else also felt hot. |
| Time course | When did it begin and on how many nights has it happened? |
| Context | Temperature, new medicines and other symptoms at the same time. |
Could it be menopause?
Hot flushes and sweating can occur during menopause. Describe menstrual changes and whether episodes also happen during the day. Do not assume that every new sweating symptom has this explanation simply because your age fits.
What can primary care assess?
A discussion, medicine review and physical examination usually guide the assessment. Selected blood tests may be useful; everyone does not need the same panel. Ask what each proposed test could contribute and what the plan is if results are normal but symptoms continue.
- Bring names and start dates of new medicines.
- Record which symptoms began before or after the sweating.
- Ask when to return if it does not settle.
When to get help
Contact a vårdcentral, a Swedish primary care centre, for recurrent night sweats or heavy sweating with prolonged fever, fatigue or weight loss. Becoming acutely very unwell, developing severe breathlessness or altered consciousness needs emergency help. Call 1177 for advice about urgency and 112 for life-threatening symptoms.
Sources and further reading
Sources and links checked on 22 October 2026. Editorial team: Hagakliniken. General information; individual assessment may differ.