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Headache: A Complete Medical Guide
What is a Headache?
A headache is defined as pain anywhere in the region of the head or neck. It is one of the most common symptoms encountered in clinical medicine and affects virtually everyone at some point in life. Pain arises from activation of pain-sensitive structures - the large intracranial vessels, the dura mater, and pericranial muscles are all innervated by the trigeminal nerve (the trigeminovascular system). The brain parenchyma itself has no pain receptors.
From the perspective of prevalence, Harrison's Principles of Internal Medicine (22nd Ed.) places tension-type headache at 69% of all headaches, migraine at 16%, while brain tumor causes headache in only 0.1% - meaning the vast majority of headaches are benign.
Classification: Primary vs Secondary
The most important clinical distinction is between primary and secondary headaches, per the International Classification of Headache Disorders, 3rd Edition (ICHD-3):
| Category | Definition | Examples |
|---|---|---|
| Primary | Headache IS the disorder; no underlying cause | Tension-type, Migraine, Cluster |
| Secondary | Headache is a symptom of another condition | Meningitis, SAH, tumor, hypertension |
Part I: Primary Headaches (Detailed)
1. Tension-Type Headache (TTH) - Most Common (69%)
Description: The classic "everyday headache" - a steady, dull, bilateral ache often described as a band tightening around the head. Renamed from "tension headache" because it is not primarily caused by muscle tension or stress.
Features:
- Bilateral location
- Quality: pressing, tightening (non-pulsating)
- Mild to moderate intensity - does not stop daily activity
- No nausea, no vomiting
- May have mild photophobia OR phonophobia (not both)
- Lasts 30 minutes to several days
Subtypes:
- Infrequent episodic - less than 1 day/month
- Frequent episodic - 1-14 days/month
- Chronic - 15+ days/month for 3+ months; can run continuously for years and is associated with depression
Causes/Triggers: Stress, fatigue, poor posture, sleep deprivation, hunger, dehydration, eye strain, anxiety
Treatment:
| Approach | Options |
|---|---|
| Mild/acute | Acetaminophen (paracetamol), NSAIDs (ibuprofen, naproxen, aspirin) |
| Non-pharmacologic | Muscle relaxation techniques, massage, moist heat, biofeedback, cognitive behavioral therapy |
| Chronic prevention | Tricyclic antidepressants (amitriptyline 10-25 mg at night, up to 1 mg/kg) |
| Lifestyle | Regular sleep, regular meals, regular exercise (150 min/week moderate aerobic activity), stress management |
Note: Frequent use of over-the-counter analgesics (more than 10-15 days/month) leads to medication overuse headache (MOH), a major complication.
2. Migraine - Second Most Common (16%)
Description: Migraine is a brain disorder - not simply a vascular headache. It involves complex neurological sensitization and the trigeminovascular system. Functional neuroimaging shows it involves the brainstem and hypothalamus.
Diagnostic Features (ICHD-3 criteria - at least 2 of 4):
- Unilateral location
- Pulsating/throbbing quality
- Moderate to severe intensity
- Aggravated by routine physical activity
Plus at least 1 of:
- Nausea and/or vomiting
- Photophobia AND phonophobia
Duration: 4-72 hours (untreated)
Clinical tip (mnemonic = PIN): Migraine can be diagnosed with 93% positive predictive value when 2 of 3 features are present: Photosensitivity, Incapacitation, Nausea. (Neuroanatomy through Clinical Cases, 3rd Ed.)
Subtypes:
| Subtype | Key Feature |
|---|---|
| Migraine without aura ("common migraine") | Most common (80% of migraines); meets above criteria |
| Migraine with aura ("classic migraine") | Preceded by reversible focal neurologic symptoms (aura) developing over 5-20 min, lasting <60 min; occurs in ~20% of migraineurs; most commonly visual (fortification spectra, scotomata) |
| Chronic migraine | ≥15 headache days/month, with migraine features on ≥8 days/month |
| Hemiplegic migraine | Motor weakness as part of aura |
| Brainstem aura migraine | Dysarthria, vertigo, tinnitus, diplopia |
Aura: Typically visual - zigzag patterns (fortification spectra), blind spots (scotomata), or sensory paresthesias spreading over 5-20 minutes. Aura without headache also occurs.
Triggers: Menstruation, stress, sleep changes (too much or too little), certain foods (aged cheese, red wine, caffeine withdrawal), weather changes, strong odors, bright lights
Phases of a Migraine Attack:
- Prodrome (hours to days before) - mood changes, yawning, neck stiffness, food cravings
- Aura (if present) - reversible neurologic symptoms
- Headache phase - the main pain
- Postdrome - fatigue, "migraine hangover"
Treatment:
Abortive (acute attack) therapy:
| Severity | First-line Options |
|---|---|
| Mild-moderate | NSAIDs (ibuprofen, naproxen, aspirin), caffeine-containing combination analgesics (e.g., Excedrin) |
| Moderate-severe | Triptans (5-HT1B/D agonists): sumatriptan, rizatriptan, zolmitriptan, eletriptan - take at headache onset |
| Severe/refractory | Ergotamine/dihydroergotamine (DHE), CGRP antagonists ("gepants": ubrogepant, rimegepant), ditans (lasmiditan - 5-HT1F agonist) |
| With nausea/vomiting | Metoclopramide IV (also treats headache directly); prochlorperazine as second-line; dopamine blockers |
| Quiet environment | Rest in dark, quiet room is effective for milder attacks |
Preventive therapy (indicated when attacks are frequent or disabling):
| Drug Class | Examples |
|---|---|
| Beta-blockers | Propranolol, metoprolol |
| Calcium channel blockers | Flunarizine, verapamil |
| Antiepileptics | Topiramate, valproate |
| Tricyclic antidepressants | Amitriptyline, nortriptyline |
| CGRP monoclonal antibodies (newest) | Erenumab, fremanezumab, galcanezumab - effective and well-tolerated in chronic migraine |
| CGRP receptor antagonists (gepants) | Atogepant (oral, daily) |
| Candesartan (ARB) | Emerging evidence |
| Botulinum toxin (Botox) | For chronic migraine (≥15 days/month) |
3. Cluster Headache - Most Painful Primary Headache
Description: Cluster headache belongs to the Trigeminal Autonomic Cephalalgias (TACs) - primary headache disorders with unilateral trigeminal pain plus ipsilateral cranial autonomic features. It is less than 1/10th as common as migraine, but the pain is described as one of the most severe known to medicine (nicknamed "suicide headache").
Key Features:
- Prevalence: ~0.1% of population; 4:1 male predominance
- Unilateral, strictly one-sided retro-orbital or periorbital severe pain
- Quality: boring, stabbing, "red hot poker through the eye"
- Duration: 15-180 minutes per attack
- Frequency: 1-8 attacks per day, occurring in "clusters" (daily attacks for weeks to months), then remission for months
Ipsilateral Autonomic Features (at least one required):
- Lacrimation (tearing)
- Conjunctival injection (red eye)
- Ptosis and miosis (partial Horner's syndrome)
- Rhinorrhea / nasal congestion
- Facial sweating/flushing
- Aural fullness
Pathophysiology: Functional neuroimaging shows posterior hypothalamic activation during attacks - the hypothalamus acts as the "pacemaker" of cluster cycles.
Subtypes:
- Episodic - clusters separated by ≥1 month remission
- Chronic - attacks for >1 year without remission, or remissions <1 month
Other TACs:
- Paroxysmal hemicrania - like cluster but shorter (2-30 min), more frequent (>5/day), predominantly female; exquisitely responsive to indomethacin
- SUNCT/SUNA - very short attacks (seconds to minutes), extremely frequent; often requires lamotrigine or gabapentin
- Hemicrania continua - continuous unilateral headache, responds only to indomethacin
Treatment:
| Approach | Options |
|---|---|
| Acute abortion | 100% oxygen at 7-12 L/min via non-rebreather mask for 15-20 min (effective in ~70%) |
| Acute | Subcutaneous sumatriptan 6 mg (fastest onset), intranasal zolmitriptan or sumatriptan |
| Prevention during cluster period | Verapamil (first-line), oral corticosteroids (short bridge), lithium, topiramate, melatonin |
| Refractory | Greater occipital nerve block (GONB), sphenopalatine ganglion (SPG) stimulation |
4. Other Primary Headache Types
| Type | Key Features | Treatment |
|---|---|---|
| Hemicrania continua | Continuous moderate unilateral headache for ≥3 months; autonomic features; periods of exacerbation | Indomethacin (diagnostic and therapeutic) |
| Ice pick headache (primary stabbing) | Brief, intense stabs lasting seconds; "ice pick" in the eye | Indomethacin for prevention |
| Thunderclap headache (primary) | Sudden maximal headache within <1 min; diagnosis of exclusion after ruling out SAH | Exclude secondary causes first (CT urgently); nimodipine for RCVS |
| Hypnic headache | Awakens from sleep ("alarm clock headache"); elderly; bilateral | Caffeine before bed, lithium |
| Exertional headache | Triggered by physical activity | Indomethacin, propranolol |
| Coital headache | Sudden severe headache at orgasm | Exclude SAH; propranolol for prevention |
Part II: Secondary Headaches
Secondary headaches are symptoms of underlying disease. The management is treatment of the underlying cause.
Red Flags ("SNOOP4" criteria) - Require urgent evaluation:
| Warning Sign | Concern |
|---|---|
| Sudden-onset / "worst headache of life" / thunderclap | Subarachnoid hemorrhage (SAH) |
| First severe headache ever | SAH, meningitis |
| Fever + stiff neck + altered consciousness | Meningitis, encephalitis |
| Progressive worsening over days/weeks | Tumor, subdural hematoma |
| New headache in cancer patient / HIV | Brain metastasis, CNS infection |
| Onset after age 55 | Giant cell arteritis, tumor |
| Vomiting preceding headache | Raised intracranial pressure |
| Pain worsens on bending/coughing/Valsalva | Raised ICP, Chiari malformation |
| Abnormal neurologic exam | Any structural lesion |
| Pain over temporal artery (tender) in elderly | Giant cell arteritis |
Key Secondary Headache Types:
1. Subarachnoid Hemorrhage (SAH)
- "Worst headache of life," maximal within seconds
- Stiff neck, but no fever
- Caused by ruptured aneurysm
- Emergency CT, then LP if CT negative → look for xanthochromia
2. Meningitis
- Severe headache + stiff neck + fever + photophobia
- LP is mandatory (after CT to rule out mass)
- IV antibiotics immediately if suspected
3. Intracranial Tumor
- Headache in ~50% of brain tumor patients
- Typically bifrontal (worse on tumor side), similar to tension headache in quality
- Worse on bending; associated with nausea/vomiting; may be worse in morning
- MRI is investigation of choice
4. Medication Overuse Headache (MOH)
- Paradoxically caused by frequent use of headache medications
- Occurs with analgesics >15 days/month, or triptans/ergotamines >10 days/month
- Daily or near-daily headache
- Treatment: gradual withdrawal of offending medication
5. Giant Cell Arteritis (Temporal Arteritis)
- Elderly patients (>50 years), new unilateral headache
- Tender temporal artery, jaw claudication, elevated ESR/CRP
- Risk of sudden blindness if untreated
- Treat immediately with oral corticosteroids; confirm with temporal artery biopsy
6. Idiopathic Intracranial Hypertension (Pseudotumor Cerebri)
- Obese young women; chronic daily headache; papilledema; normal MRI
- Opening pressure >25 cm H2O on LP
- Treatment: weight loss, acetazolamide, LP drainage, shunt surgery for refractory cases
7. Hypertensive Headache
- Occurs with severe hypertension (BP >180/120 mmHg)
- Occipital, present on waking
- Resolves with blood pressure control
8. Post-Dural Puncture (Spinal) Headache
- After lumbar puncture, epidural procedures
- Orthostatic - worse when sitting/standing, better lying flat
- CSF leak causes decreased intracranial pressure
- Treatment: bed rest, hydration, caffeine; epidural blood patch for severe/persistent cases
9. Cervicogenic Headache
- Pain referred from cervical spine/neck structures
- Unilateral, starts in neck/occiput, radiates to forehead
- Restricted cervical movement
- Treatment: physiotherapy, NSAIDs, nerve blocks
Non-Pharmacologic Treatments (General)
Applicable across multiple headache types:
- Regular sleep schedule (avoid both too much and too little sleep)
- Regular meals (avoid skipping meals - hypoglycemia triggers headache)
- Adequate hydration
- Regular aerobic exercise (150 min/week)
- Stress management, biofeedback, mindfulness
- Identify and avoid personal triggers (keep a headache diary)
- Acupuncture (evidence-based for tension and migraine prevention)
- Cognitive behavioral therapy (CBT)
- Physical therapy for cervicogenic and tension headaches
Summary Table: Quick Comparison of the 3 Major Primary Headaches
| Feature | Tension-Type | Migraine | Cluster |
|---|---|---|---|
| Prevalence | 69% | 16% | 0.1% |
| Sex | Equal | F > M (3:1) | M > F (4:1) |
| Location | Bilateral | Unilateral (often) | Unilateral, periorbital |
| Quality | Pressing, tightening | Throbbing, pulsating | Boring, stabbing |
| Severity | Mild-moderate | Moderate-severe | Severe (worst possible) |
| Duration | 30 min - days | 4-72 hours | 15-180 min |
| Nausea | No | Yes | Uncommon |
| Autonomic features | No | Sometimes | YES (defining) |
| Activity | Not worsened | Worsened | Restlessness, pacing |
| Acute treatment | NSAIDs, acetaminophen | Triptans, NSAIDs, gepants | O2, subcutaneous sumatriptan |
| Prevention | Amitriptyline | Beta-blockers, topiramate, CGRP mAbs | Verapamil |
Latest Evidence (PubMed, 2024-2026)
A landmark 2024 BMJ network meta-analysis (PMID: 39293828) comparing drug interventions for acute migraine in adults confirmed triptans remain highly effective for aborting attacks, with newer CGRP antagonists (gepants) offering comparable efficacy with fewer cardiovascular concerns - important for patients who cannot take triptans.
Sources: Harrison's Principles of Internal Medicine 22E (2025); Neuroanatomy through Clinical Cases 3rd Ed.; Frameworks for Internal Medicine; Bradley and Daroff's Neurology in Clinical Practice; ICHD-3 classification; Karlsson et al., BMJ 2024 (PMID: 39293828)
Create a PDF quick reference guide for distinguishing migraine from tension headache
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Migraine vs Tension Headache QuickRef
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Here's what's packed into this single A4 quick reference guide:
Layout - 3 zones:
-
Header band (dark indigo) - Title and subtitle in white/lavender
-
Main comparison table (15 rows) - Color-coded columns:
- Purple = Migraine column
- Blue = Tension-type column
- Covers: Prevalence, Sex, Location, Quality, Severity, Duration, Nausea, Photophobia, Phonophobia, Aura, Effect of activity, Prodrome, Autonomic features, Triggers, Pathophysiology
-
Three side-by-side boxes at the bottom:
- PIN Mnemonic (lavender) - Photosensitivity + Incapacitation + Nausea = 93% PPV for migraine
- Treatment Summary - Acute and preventive options for both headache types, including gepants and CGRP monoclonal antibodies
- Red Flags (red) - 11 warning signs requiring urgent investigation (SAH, meningitis, tumor, etc.)
Sources cited in the footer: Harrison's Principles of Internal Medicine 22E, Neuroanatomy Through Clinical Cases 3rd Ed., ICHD-3.
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