Night sweats are episodes of excessive sweating during sleep that can sometimes soak bedding. They can occur alone or alongside other symptoms; when other signs are present a medical evaluation may be needed.
Night sweats are periods of unusually heavy sweating during sleep. For some people this is a mild increase in perspiration; for others it can be enough to dampen sheets or sleepwear. To tell night sweats apart from normal warmth-related sweating, clinicians consider how often they happen, how intense they are and whether they come with other signs such as fever, chills, or unexplained weight loss.
A range of factors can underlie night sweats. Common contributors include hormonal changes (for example during menopause), infections, some cancers, side effects of medications, anxiety or autonomic nervous system changes, and metabolic or thyroid disorders. Because many conditions can cause similar symptoms, a single episode rarely identifies the cause.
Seek medical advice if night sweats are new or getting worse; if they come with high fever, unexplained weight loss, persistent pain, ongoing fatigue, or breathlessness; or if they begin after starting a new medication. If symptoms are sudden, severe, or life‑threatening, contact emergency services.
Lifestyle adjustments can help and tracking symptoms supports evaluation. Try keeping the bedroom cool, using breathable bedding and cotton sleepwear, and limiting alcohol or heavy meals before bed. Record how often sweating occurs, how long it lasts, recent medications, and any other symptoms to bring to your clinician.
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