Chills when tired: what to know

Feeling cold and worn out after missing sleep, eating too little, becoming chilled or doing strenuous activity may improve with warmth, food, fluids and rest. Chills that persist or appear with fever, aches, cough, urinary symptoms or pain deserve more attention. Influenza may cause pronounced fatigue and chills, while pneumonia may add cough or breathing difficulty. A kidney infection or urinary tract infection can cause tiredness with chills and urinary or back symptoms.

Malaria and dengue fever are relevant after travel or mosquito exposure. Sepsis can cause an unusually severe illness with confusion, rapid breathing or a swift decline. Chills and tiredness alone cannot distinguish these causes, and a symptom pattern is more useful than one isolated episode.

Warm up gradually, drink fluids and eat a regular light meal if you have not eaten. Prioritise sleep and pause strenuous activity. Take your temperature and note cough, pain, urinary changes, rash, vomiting or diarrhoea. Review new medicines with a pharmacist rather than stopping prescribed treatment on your own. If you remain unusually exhausted despite rest, arrange a medical review.

Seek prompt care for recurring chills, persistent fever, worsening weakness, a new rash, severe headache, painful urination, back pain or cough with shortness of breath. Emergency help is needed for confusion, fainting, severe breathing difficulty, blue or grey lips, inability to stay awake or rapid worsening. Mention any recent travel, mosquito exposure, pregnancy, immune condition or long-term illness.

Ask whether the pattern fits sleep or exertion, an infection or a medicine effect; whether you need an examination or tests; and how long to monitor symptoms. Bring a list of medicines and a record of temperature, sleep, food, travel and associated symptoms.