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Sudden shooting headache like a hammer being hit with rise in bp

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"thunderclap headache" AND diagnosis

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sudden severe thunderclap headache emergency evaluation NIH

Seek emergency care now. A sudden, severe “hammer-hit” or shooting headache, especially if it reached maximum intensity within seconds to a minute, can be a thunderclap headache. It needs urgent assessment to rule out bleeding around the brain, stroke, or other blood-vessel problems. The rise in blood pressure may be a reaction to severe pain, but it can also accompany a hypertensive emergency.
Call your local emergency number or have someone take you to an emergency department now. Do not drive yourself.
Call an ambulance immediately if any of these are present: weakness or numbness, facial droop, difficulty speaking, confusion, fainting, seizure, vision change, vomiting, stiff neck, chest pain, shortness of breath, or BP 180/120 mmHg or higher.
While waiting:
  • Sit or lie somewhere safe, stay with someone if possible.
  • Recheck BP after 5 minutes of quiet rest, but do not delay going for repeated checks.
  • Do not take extra or unprescribed blood-pressure medication to rapidly lower it.
  • Avoid aspirin, ibuprofen, alcohol, exertion, and driving until a clinician has assessed you.
Emergency references describe thunderclap headache as severe pain peaking in under one minute and recommend urgent brain imaging and further testing when indicated. Neurology reference

Pain still persisting in one side but less than the initial intensity

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"thunderclap headache" AND emergency

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sudden severe headache emergency symptoms official health source

A headache that was sudden and very severe at onset still needs emergency assessment even if it has eased and is now one-sided. Improvement does not safely rule out bleeding, a blood-vessel problem, stroke, or a dangerous blood-pressure complication.
Please go to the emergency department now or call emergency services. Do not drive yourself.
Call an ambulance immediately if you have any weakness/numbness, face droop, speech or vision trouble, vomiting, fainting, confusion, neck stiffness, seizure, chest pain, breathlessness, or a BP reading of 180/120 or higher.
Do not take extra blood-pressure tablets or aspirin/ibuprofen to try to manage this at home unless a clinician who knows your situation tells you to.

What tests might the emergency department perform?

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ACEP clinical policy acute headache emergency department CT lumbar puncture CTA

They will usually start with:
  1. Immediate assessment
    • Repeat blood pressure in both arms if needed, pulse, oxygen level, temperature
    • Brief neurological exam: speech, face/limb strength, sensation, coordination, pupils, vision, and neck stiffness
    • ECG if BP is very high or there is chest pain, palpitations, or shortness of breath
  2. Non-contrast CT scan of the head
    • This is often the first urgent scan to look for bleeding in or around the brain, especially subarachnoid hemorrhage.
  3. Blood and urine tests
    • Blood count, glucose, kidney function and electrolytes
    • Blood-clotting tests, particularly if you use anticoagulants
    • Sometimes pregnancy testing before certain imaging or medicines
    • Urine testing may help assess effects of severe hypertension
  4. CT angiography (CTA) of the head and sometimes neck
    • Uses contrast dye to examine brain and neck arteries for an aneurysm, artery tear/dissection, narrowing, or vasoconstriction.
  5. Lumbar puncture, in selected cases
    • A sample of spinal fluid may be taken if the CT is normal but doctors still suspect bleeding, or if infection or abnormal pressure is a concern. Current emergency guidance supports either lumbar puncture or CTA when a person remains at risk after a negative non-contrast CT. ACEP policy summary
  6. MRI/MRA/MRV
    • Not always first, but may be used if CT/CTA does not explain the headache or if they need to assess for a small stroke, cerebral venous clot, artery problem, or pituitary condition.
The exact sequence depends particularly on when the headache started, your BP readings, neurological examination, medicines such as blood thinners, and whether you have vomiting, neck pain, visual changes, weakness, or confusion.
Given the sudden severe onset you described, please do not wait for it to worsen again before being assessed.
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