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Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

Migraine and Headache Red Flags

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In one line

·Migraine is a brain disorder where waves of overactive nerve signals cause severe head pain (usually on one side), often with light and sound sensitivity, nausea, and sometimes vision changes. Some headaches hide dangerous causes like bleeding in the brain, infection, stroke, or torn blood vessels — so we always check for red flags first.

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Normal physiology

·Normally, your brain's nerve cells fire in smooth, organized patterns, and the blood vessels wrapped around the outside of your brain stay steady and quiet. The trigeminal nerve — the big pain nerve that covers your face, forehead, and the coverings of your brain (the meninges) — sits silent unless there is real danger. This balance keeps your head pain-free and your senses comfortable.

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What goes wrong

·In migraine, the brain's nerve cells become too excitable and fire off a slow, rolling wave of overactivity across the cortex — a process called cortical spreading depression. That wave makes the blood vessel nerves release a pain-amplifying chemical called CGRP (calcitonin gene-related peptide), which turns on the trigeminal nerve like a fire alarm. The trigeminal nerve then sends strong pain signals to the brainstem, which cranks up the volume on everything — light hurts, sound hurts, and your stomach joins in by making you feel sick. About 1 out of 3 people also see warning signs (aura) like flashing lights or zigzag lines, because the wave moves through the brain's vision center in the back before the headache hits. This is the primary breakdown in migraine: overexcitable brain waves, CGRP release, and trigeminal nerve activation — not a problem with blood vessels squeezing or opening (the old theory). However, in secondary headaches, the problem is not the brain being too sensitive — it is a real structural danger: bleeding in the brain (subarachnoid bleeding (hemorrhage)), infection (meningitis or encephalitis), stroke, a torn artery (dissection), very high blood pressure, or a growing mass like a tumor or abscess. These cause pain by stretching or irritating the meninges, raising pressure inside the skull, or directly damaging brain tissue. Red flags — like thunderclap (instant worst headache of your life), fever with stiff neck, sudden confusion or weakness, new headache in someone over 50, or vision loss with jaw pain — are the body's way of saying this is not just a migraine; something structural is breaking and needs emergency imaging or a spinal tap.

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Hallmark signs

·Throbbing or pounding pain on one side of the head
·Pain that gets worse with movement, bright light, or loud noise
·Nausea or throwing up
·Seeing flashing lights, zigzag lines, or blind spots (aura)
·Trouble thinking clearly or finding words
·Numbness or tingling, usually on one side of the face or hand
·Sudden, explosive 'thunderclap' headache that peaks in seconds
·Headache with fever, stiff neck, confusion, or rash

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Red flags · escalate now

·Thunderclap headache (worst headache of your life, peaking in less than one minute)
·Headache with fever, stiff neck, confusion, or skin rash
·New headache after age 50, or a sudden change in your usual headache pattern
·Headache that gets worse with coughing, sneezing, straining, or lying down
·Headache plus weakness, vision loss, slurred speech, or trouble walking

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Workup

·Non-contrast head CT (computed tomography scan)
·Brain MRI with and without gadolinium contrast
·Lumbar puncture (spinal tap) with opening pressure and cerebrospinal fluid (CSF) analysis
·Red blood cell (Erythrocyte) sedimentation rate (ESR) and C-reactive protein (CRP)
·Magnetic resonance angiography (MRA) or CT angiography (CTA) of the head and neck
·Complete blood count (CBC) with differential
·Basic metabolic panel (BMP)
·Fundoscopic exam (looking at the back of the eye with an ophthalmoscope)

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Treatment

·Triptan (sumatriptan 50–100 mg by mouth or 6 mg subcutaneous, rizatriptan 10 mg, or zolmitriptan 2.5–5 mg)
·NSAID (ibuprofen 400–800 mg, naproxen 500–550 mg, or ketorolac 30 mg IV)
·Anti-nausea medicine (metoclopramide 10 mg IV or by mouth, ondansetron 4–8 mg, or prochlorperazine 10 mg IV or 25 mg rectal)
·Preventive medicine taken every day: beta-blocker (propranolol 80–240 mg or metoprolol 100–200 mg), antiepileptic (topiramate 50–200 mg or valproate 500–1000 mg), or tricyclic antidepressant (amitriptyline 25–100 mg at bedtime)
·CGRP monoclonal antibody (erenumab 70–140 mg monthly, fremanezumab 225 mg monthly or 675 mg quarterly, galcanezumab 240 mg first dose then 120 mg monthly, or eptinezumab 100 mg IV every 3 months)
·Gepant (rimegepant 75 mg or ubrogepant 50–100 mg by mouth for acute migraine; atogepant 60 mg daily or rimegepant 75 mg every other day for prevention)
·Healthy habits: regular sleep schedule (same bedtime and wake time every day, 7–9 hours), drink 8 glasses of water daily, manage stress (deep breathing, exercise, cognitive behavioral therapy), avoid overusing pain medicine (no more than 2 days per week)

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NCLEX trap

·Nausea comes from a wave of electrical activity spreading across the cortex (the outer layer of the brain) during a migraine attack—it is not the root cause. You must stop the wave itself with a triptan like sumatriptan (a medicine that narrows swollen blood vessels and blocks pain signals in the trigeminal nerve, the main nerve that carries head sensation) or a CGRP blocker like ubrogepant (a medicine that stops CGRP, the brain's migraine messenger that triggers inflammation). When you stop the wave, both the pain and the nausea go away together.
·If this headache is new, the worst ever, came on like a thunderclap (peak pain in seconds), is different from the patient's usual pattern, OR the patient is over 50 and new to migraines, you MUST get a brain scan (non-contrast CT or MRI) or blood tests (ESR and CRP for giant cell arteritis, an inflammation of the arteries) to rule out bleeding, tumor, stroke, or inflammation. Never assume it is just another migraine when red flags are present.
·Only 1 out of 3 people with migraine ever has aura (temporary vision changes like zigzag lines or tingling that spreads slowly over 5 to 20 minutes). Migraine without aura is the most common type and is still true migraine. The diagnosis does not need aura.
·Overusing pain medicine (more than 10 days a month) causes medication-overuse headache, where the brain rebounds and makes new headaches. But using the right prevention medicine—like a beta-blocker such as propranolol (a medicine that lowers heart rate and calms blood vessels), an antiseizure drug like topiramate or divalproex (medicines that quiet overactive brain signals), or a CGRP antibody like erenumab, fremanezumab, or galcanezumab (shots given once a month that block the migraine messenger)—actually cuts down the number of migraines without causing rebound. Prevention is safe and key for frequent attacks (4 or more a month or disabling attacks).
·Ibuprofen is a general pain blocker and often is not strong enough for the brain wave driving a migraine. Migraine needs a targeted tool: a triptan like sumatriptan or rizatriptan (medicines that narrow swollen blood vessels and block pain signals in the trigeminal nerve), a gepant like ubrogepant or rimegepant (CGRP blockers that stop the inflammatory messenger), or lasmiditan (a medicine that calms overactive serotonin pathways in the brain). These hit the upstream cause.
·Migraine is a neurologic disease where a wave of electrical activity called cortical spreading depression spreads across the cortex (the outer layer of the brain), triggering inflammation and pain in the trigeminal nerve (the main face and head nerve). Treat the attack with migraine-specific drugs (triptans, gepants, or ditans like lasmiditan), prevent future attacks with prevention (prophylaxis) medicine if the patient has 4 or more migraines a month or disabling attacks, and always screen for red flags: sudden thunderclap onset, worst-ever headache, fever, stiff neck, focal weakness, vision loss that stays, confusion, trouble speaking, or new headache pattern over age 50. These point to bleeding, stroke, infection, or giant cell arteritis.

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