What should you know about body sweating a lot?

Night sweats are episodes of heavy sweating during sleep that soak clothing or bedding even when the room is cool. A warm room, thick bedding, alcohol, spicy food, anxiety, or exercise late in the day can cause temporary sweating. Repeated episodes deserve attention, particularly when they are new or interfere with sleep.

The pattern helps a clinician narrow the possibilities. Sweating with a fever, chills, cough, diarrhoea, or feeling generally unwell can occur with an infection such as glandular fever, brucellosis, or HIV infection. Sweating with a racing heartbeat, shakiness, heat intolerance, or weight loss can occur with hyperthyroidism.

Hot flushes and night sweats can accompany menopause. Less commonly, persistent sweating with unexplained weight loss, swollen lymph nodes, marked tiredness, or easy bruising may occur with lymphoma, Hodgkin lymphoma, or chronic myeloid leukaemia. These symptoms do not identify a diagnosis by themselves; many benign causes are possible.

Keep the bedroom cool, choose light sleepwear, and use breathable bedding. Note when sweating happens, whether it wakes you, how wet the clothing or bedding becomes, and any fever, pain, cough, palpitations, bowel changes, or weight change.

Review recent changes such as a new medicine, dose adjustment, alcohol use, recreational drugs, illness, stress, or menstrual and menopausal symptoms. Do not stop a prescribed medicine without medical advice. Arrange a routine appointment if episodes keep returning, have no clear trigger, or are affecting sleep or daily activities.

Seek urgent medical help for heavy sweating with chest pain, severe shortness of breath, fainting, confusion, or signs of a serious allergic reaction. Prompt assessment is also appropriate for sweating with a persistent high fever, severe weakness, or rapid unexplained deterioration.

Book a medical review for repeated night sweats, especially if they occur with unexplained weight loss, a persistent cough, swollen glands, ongoing fever, unusual bruising, or significant fatigue. A clinician may examine you and decide whether blood tests or other checks are useful based on the full pattern.

You could ask: What might explain the timing and amount of my sweating? Could any of my medicines or supplements contribute? Which symptoms should prompt urgent help? Do I need an examination or tests, and what should I record before my next appointment?