Cold Chills at Night: What They May Mean and What to Do

Chills may feel like shivering, teeth chattering, or waves of cold even when the room feels comfortable. They can occur before, during, or after a fever and may be accompanied by sweating as your temperature changes.

A cool room, damp clothing, tiredness, anxiety, or a normal temperature shift during sleep can cause short-lived chills. Fever-related chills are often part of the body's response to an infection. Influenza, pneumonia, dengue fever, malaria, a urinary tract infection, or a kidney infection can include chills, although chills alone cannot identify the cause.

Notice what occurs alongside the chills. Cough, breathlessness, sore throat, vomiting, diarrhoea, pain or burning when urinating, back or side pain, rash, headache, or recent travel to a malaria-risk area can change how quickly you should be assessed. Repeated episodes without an obvious environmental trigger also deserve medical advice.

Move to a comfortably warm, dry setting and change out of damp clothes. Use light layers or a blanket while the episode passes, but avoid overheating yourself. Sip fluids if you can, rest, and check your temperature with a thermometer rather than judging fever by touch alone.

Record when the chills started, how long they lasted, your temperature, and any other symptoms. If episodes return, contact a clinician for an assessment. Do not start leftover antibiotics or malaria treatment; the appropriate treatment depends on the cause and may require an examination or tests.

Seek urgent medical help for chills with trouble breathing, chest pain, confusion, fainting, a seizure, blue or grey lips, severe weakness, or skin that is unusually cold and clammy. These can be warning signs of a serious illness, including sepsis, and should not be watched at home.

Arrange prompt medical advice for a high or persistent fever, repeated night chills, severe headache, stiff neck, a spreading rash, dehydration, ongoing vomiting, new back or side pain, or feeling markedly unwell. Get advice promptly after travel to a malaria-risk area, even if the fever or chills come and go.

Ask what causes best fit the timing and accompanying symptoms, whether your temperature pattern needs testing, and which warning signs should prompt urgent review. Tell the clinician about recent travel, sick contacts, new medicines, pregnancy, long-term conditions, and any urinary or breathing symptoms.