Temperature with chickenpox: what to know

Chickenpox can cause fever, tiredness, reduced appetite and an itchy blistering rash. The temperature may change as new spots appear and as the immune system responds. A thermometer reading is useful, but behaviour matters too: unusual sleepiness, poor drinking or breathing difficulty can be more concerning than the number alone. Fever is a symptom, not proof of a particular complication.

Keep the person away from people who are pregnant, immunocompromised or not immune until a clinician confirms they are no longer contagious. Scratching can damage blisters and allow skin infection, so keep nails short and use gentle skin care.

Offer frequent fluids and light clothing, and let the person rest. Check temperature when they seem unwell and record changes for a clinician. Use only age-appropriate fever relief according to a healthcare professional or the product instructions; do not give aspirin to a child with chickenpox. Ask a pharmacist or clinician before using medicines, especially for a young child, pregnancy or another medical condition.

Avoid popping blisters. A cool bath, loose clothing and advice about an oral antihistamine may ease itching. A GP consultation can confirm the diagnosis and decide whether antiviral treatment is appropriate, particularly when illness is severe or the person has higher medical risk.

Seek urgent medical help for trouble breathing, confusion, a stiff neck, severe headache, repeated vomiting, difficulty waking, signs of dehydration or a rapidly worsening condition. Contact a clinician promptly if the skin around blisters becomes increasingly red, hot, swollen or painful, or if pus develops. Arrange medical advice for a baby, pregnancy, weakened immunity or a persistent fever. Do not attend a clinic unannounced if chickenpox is possible; call first so others can be protected.

Ask whether the rash and temperature fit chickenpox, how often to check temperature, which fever medicine is suitable, whether antiviral treatment is indicated, and when school, childcare or work can safely resume.