What should you know about evening chills?

Chills are an involuntary feeling of cold, sometimes with shivering or teeth chattering. They can appear as body temperature rises during a fever, even when the surrounding room feels comfortable. An evening pattern may reflect the timing of an infection, daily temperature changes, or symptoms becoming more noticeable when you stop your usual activities.

Possible illnesses include influenza, pneumonia, a urinary tract infection, kidney infection, malaria, or dengue fever. Chills alone cannot identify the cause. Notice whether you also have fever, cough, breathing difficulty, headache, muscle aches, pain when passing urine, back or side pain, vomiting, rash, or recent travel to a malaria-risk area.

Rest, drink fluids if you can, and use light layers so you can adjust your comfort without overheating. Check your temperature with a thermometer and record when the chills start, how long they last, and any related symptoms. This pattern can help a clinician decide whether an examination or tests are needed.

Avoid very hot baths or heavy blankets if you have a fever. Do not start antibiotics or antimalarial treatment without medical advice, because the right treatment depends on the cause. If you have recently travelled, mention the countries and dates to the clinician.

Arrange prompt medical assessment if evening chills keep returning, occur with a high or ongoing fever, or accompany urinary symptoms, a cough, worsening pain, vomiting, a rash, or recent travel. A clinician may need to assess for infections such as pneumonia, kidney infection, malaria, or dengue fever.

Seek emergency help for trouble breathing, confusion, fainting, severe weakness, blue or grey lips, severe dehydration, or rapidly worsening illness. These symptoms can signal a serious infection, including sepsis, and should not be monitored at home.

Ask what might explain the evening timing, whether your temperature pattern matters, and which symptoms should trigger urgent review. Share your medicines, recent travel, exposure to illness, and any urinary, breathing, digestive, or skin changes.