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What to do if…
you develop a new severe headache with nausea after a recent infection

Produced and maintained by PanicStation.org Published: Last reviewed: Editorial policy USA guide

Short answer

A new severe headache with nausea after a recent infection needs prompt medical advice today. Call 911 now for sudden explosive or worst-ever pain, stroke-like symptoms, a seizure, fainting or collapse, confusion, or difficulty staying awake; otherwise go to an emergency department now if you have fever with a stiff neck, light sensitivity, repeated vomiting, a new dark purple rash, or symptoms that are escalating quickly.

Do not do these things

  • Do not delay getting medical advice to see whether a new severe or worsening headache settles on its own.
  • Do not drive yourself if you feel faint, confused, very drowsy, unsteady, or unable to travel safely.
  • Do not take more acetaminophen than the label directs.
  • Do not combine acetaminophen-containing products, including some cold and flu medicines, without checking the labels.

What to do now

  1. Call 911 now if the headache started suddenly and explosively, feels like the worst headache you have had, or comes with new face droop, weakness, numbness, trouble speaking, sudden vision changes, sudden loss of balance, a seizure, fainting or collapse, confusion, or difficulty staying awake.
  2. Go to an emergency department now if you have a severe headache with fever and a stiff neck, light sensitivity, repeated vomiting, a new dark purple rash, or symptoms that are escalating quickly. Call 911 instead if you cannot travel safely or you are rapidly getting worse.
  3. If none of those signs are present, seek prompt same-day medical advice. Call your clinic or an insurer nurse advice line if one is available. If you cannot get prompt guidance or your symptoms worsen, go to an emergency department.
  4. Ask someone to stay with you if possible and help with transport. Tell them if the pain changes quickly or you become more drowsy, confused, weak, or unsteady.
  5. Prepare a short symptom summary. Note when the recent infection started, when the headache began, how quickly it became severe, whether it feels different from previous headaches, and whether you have fever, vomiting, neck stiffness, light sensitivity, a new dark purple rash, confusion, weakness, numbness, or vision or speech changes.
  6. Bring your medication bottles or a medication list. Include cold and flu medicines, pain medicines, allergies, and any condition or medicine that affects your immune system.
  7. While arranging care, drink water if you can keep fluids down.

What can wait

  • You do not need to decide whether this is a migraine, a sinus headache, or something else before getting assessed.
  • You do not need to finish chores, search online for a diagnosis, or arrange long-term follow-up now.
  • You do not need to drive yourself to save time.

Important reassurance

Getting checked promptly is a reasonable safety step. You do not need to work out the cause yourself before asking for medical help.

Scope note

These are first steps only. Later decisions, including testing, treatment, and follow-up, depend on a clinician’s assessment and may need specialist help.

Important note

This is general information, not medical, therapeutic, or other professional advice, and not a diagnosis. Seek urgent medical care if symptoms are severe, sudden, worsening, or worrying.

Additional Resources

Closely connected guides that may be useful during the same situation or its immediate aftermath.

About this guide

This guide was produced and is maintained by PanicStation.org using its published editorial process. Official and specialist sources are checked where relevant, and AI-assisted tools may be used for drafting, organisation, and consistency checks. The site operator remains responsible for publication, revision, and removal decisions.

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