What is the appropriate evaluation and management of a headache in the emergency department?

ED Headache Management

For acute headache in the emergency department, first rule out life-threatening secondary causes using red flag criteria and focused neurological examination, then treat confirmed primary headaches with antidopaminergic agents (prochlorperazine or metoclopramide) combined with NSAIDs or acetaminophen, avoiding opioids entirely. 1, 2

Initial Evaluation: Identifying Secondary Causes

Red Flag Assessment

The primary ED objective is excluding dangerous secondary headaches (subarachnoid hemorrhage, meningitis, mass lesions, acute angle-closure glaucoma) before treating primary headache disorders. 3, 4

Critical red flags requiring immediate investigation include: 3, 5

• Sudden onset "thunderclap" headache (peak intensity within seconds to minutes)
• New neurological deficits on examination
• Altered mental status or decreased level of consciousness
• Fever with meningismus
• New headache in patients >50 years or with cancer/HIV
• Headache triggered by exertion, sexual activity, or Valsalva
• Progressive worsening pattern or "worst headache of life"

Neuroimaging Decision-Making

Risk stratification strategies reliably identify which patients require emergent neuroimaging. 1 Patients with any red flags, abnormal neurological examination, or concerning historical features warrant non-contrast head CT. 1, 3

For suspected subarachnoid hemorrhage: 1

• Non-contrast head CT performed within 6 hours of headache onset has high sensitivity and may preclude further workup if negative
• If CT is negative but suspicion remains, CT angiography of the head is as effective as lumbar puncture for ruling out subarachnoid hemorrhage 1

Acute Treatment of Primary Headaches

First-Line Pharmacotherapy

Antidopaminergic agents demonstrate the highest efficacy and should be the primary treatment approach. 2

For acute migraine attacks (including status migrainosus): 4, 2

• Prochlorperazine or metoclopramide IV combined with ketorolac (NSAID) or acetaminophen 1000 mg 6, 2
• Consider adding diphenhydramine to reduce akathisia from antidopaminergics (not for analgesia) 2
• Dexamethasone should be administered to reduce headache recurrence 5, 2

Alternative effective options include: 6

• Triptans (if no contraindications to vasoconstrictors)
• Aspirin-acetaminophen-caffeine combination
• CGRP inhibitors (gepants) for acute migraine treatment

Medications to AVOID

Opioids are NOT recommended for acute primary headache treatment - they show poor effectiveness in the acute phase and should be avoided. 1, 4, 2 The American College of Emergency Physicians specifically recommends nonopioids over opioid medications for acute primary headache. 1

Tension-Type Headache Treatment

For tension-type headache: 6

• Ibuprofen 400 mg or acetaminophen 1000 mg are appropriate first-line treatments

Adjunctive Therapies

IV hydration should be limited to cases of documented dehydration, not routinely administered. 4, 2

Emerging therapies with promising evidence: 5, 2

• Ketamine infusion
• Propofol
• Nerve blocks (occipital or sphenopalatine ganglion)
• IV dihydroergotamine for refractory cases 5

Disposition and Follow-Up

Most patients are appropriate for discharge once pain improvement is achieved. 2 However, a critical and often overlooked component is referral to a Headache Center or neurology follow-up - lack of this referral results in high rates of ED relapse and repeat visits. 4

Common Pitfalls to Avoid

• Do not skip red flag assessment - most ED headaches are benign, but missing secondary causes carries high morbidity and mortality 3, 4
• Do not use opioids as they are ineffective and contribute to dependency 1, 4, 2
• Do not routinely give IV fluids unless dehydration is confirmed 4, 2
• Do not discharge without arranging specialty follow-up to prevent recurrent ED visits 4
• Do not forget dexamethasone for migraine patients to prevent early recurrence 5, 2