What to do if…
you develop shaking chills and feel suddenly much sicker than a typical viral illness
Short answer
Treat sudden shaking chills with a clear step-change in how ill you feel as urgent. Call 999 or go to A&E now if you have red-flag symptoms; otherwise contact your local urgent medical help route now, such as 111 where available.
Do not do these things
- Do not try to “sleep it off” if you feel rapidly worse, unusually weak, confused, faint, or difficult to wake.
- Do not delay getting help by repeatedly checking your temperature or waiting for medicine to work.
- Do not drive yourself if you feel faint, confused, very weak, breathless, or are shivering hard.
- Do not take leftover antibiotics or someone else’s prescription.
- Do not take more than the recommended dose of paracetamol or ibuprofen, and check labels before combining medicines.
- Do not drink alcohol or take sedating drugs to try to knock yourself out.
What to do now
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Check for emergency red flags now. Call 999 or go to A&E if any apply:
- Acting confused, slurred speech, not making sense, or difficult to wake
- Blue, grey, pale or blotchy skin, lips, or tongue
- Difficulty breathing, breathlessness, or breathing very fast
- A rash that does not fade when you roll a glass over it
- Collapse, feeling unable to stay upright safely, or feeling that you are rapidly deteriorating
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If you do not have those red flags, still treat this as urgent. Contact your local urgent medical help route now, such as 111 where available, if any apply:
- You feel very unwell or like something is seriously wrong
- You have not had a pee all day
- You keep vomiting or cannot keep fluids down
- You have swelling or pain around a cut or wound
- You have a very high or low temperature, feel hot or cold to the touch, or are shivering
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Use clear words when you ask for help: “I have shaking chills or rigors, and I feel suddenly much sicker than a typical viral illness.”
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If you are waiting for a call back or transport, write down the basics:
- When the chills started and how fast you worsened
- Your temperature, if you can check it safely
- Whether you are breathless at rest or breathing much faster than normal
- Whether you can answer simple questions clearly, such as your name, where you are, and the date
- Whether you have passed urine today
- Any new severe chest, abdomen, back, flank, head or neck pain
- Any relentless vomiting, diarrhoea, rash, wound pain or rapidly spreading redness
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Make it easier for clinicians to act quickly:
- Keep your medication list, allergies, major conditions and pregnancy status ready.
- Mention recent infection symptoms, wounds, dental problems, surgery, new medicines, travel or close contact with someone ill.
- Say early if you have a weakened immune system, chemotherapy, transplant medicines, high-dose steroids, pregnancy or a major long-term illness.
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Reduce risk while you wait:
- Ask someone to stay with you, or stay on the phone with you, until you are assessed.
- Sip fluids if you can keep them down.
- Take paracetamol for fever or aches only if you can take it safely and follow the label; do not let feeling temporarily better delay urgent assessment.
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Escalate if anything changes. If you become confused, very breathless, develop a non-fading rash, collapse, or feel you are rapidly deteriorating, call 999.
What can wait
- You do not need to work out the exact cause right now.
- You do not need to decide what tests or treatment you might need.
- Work messages, routine plans and non-urgent logistics can wait until you have contacted urgent medical help or emergency care.
Important reassurance
Shaking chills and suddenly feeling much sicker can happen with infections that need prompt assessment. Getting checked quickly is a sensible protective step, not an overreaction.
Scope note
These are first steps only, to help you get safely assessed and avoid dangerous delay. Later decisions may need a clinician or other specialist help.
Important note
This is general information only and is not medical, legal, financial, therapeutic or other professional advice. If you may be seriously unwell, are worsening quickly, or have red-flag symptoms, seek urgent emergency care.
Additional Resources
About this guide
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