In a child presenting with headache, how should I take the history, assess the pathophysiology, perform the examination, consider differential diagnoses, and manage the condition?

Evaluation and Management of Pediatric Headache

The evaluation of a child with headache centers on distinguishing primary headaches (migraine 55%, tension-type 30%) from secondary causes through meticulous history and neurologic examination, with neuroimaging reserved only for red flag features, as imaging yields relevant findings in <1% of primary headache cases 1.

History Taking: Key Elements

Headache Characteristics

• Onset and pattern: Acute/sudden vs. chronic/recurrent
• Duration: Migraines in children often last 1-72 hours (shorter than adults)
• Location: Bilateral in children more common than adults; unilateral suggests migraine
• Quality: Throbbing (migraine) vs. pressure/band-like (tension-type)
• Severity: Use age-appropriate pain scales
• Frequency and progression: Increasing frequency/severity is concerning

Associated Symptoms

• Autonomic features: Rhinorrhea, lacrimation, nasal congestion (62% of pediatric migraineurs have cranial autonomic symptoms) 1
• Nausea, vomiting, photophobia, phonophobia
• Aura symptoms: Visual, sensory, or speech disturbances
• Neurologic symptoms: Weakness, numbness, coordination problems, vision changes

Red Flags Requiring Immediate Investigation 1, 2, 3

• Sudden onset "thunderclap" headache
• Headache awakening child from sleep or present upon awakening
• Progressive worsening over days to weeks
• Age <3 years (higher risk of secondary causes)
• Change in headache pattern or new headache type
• Systemic symptoms: Fever, weight loss, night sweats
• History of malignancy, immunodeficiency, or coagulopathy

Contextual Factors

• Triggers: Stress, sleep deprivation, dehydration, specific foods, menstruation
• Family history: Strong predictor for primary headaches
• Medication use: Including over-the-counter medications
• School performance and attendance: Impact on quality of life

Physical and Neurologic Examination: Systematic Approach

Vital Signs

• Blood pressure: Essential—hypertension can cause headache
• Head circumference: In infants <1 year (increased ICP may manifest as macrocephaly) 1

General Examination

• Skin: Neurocutaneous stigmata (café-au-lait spots, ash-leaf spots)
• Sinuses: Tenderness (though "sinus headache" is commonly misdiagnosed migraine) 1
• Temporomandibular joint: Dysfunction can cause headache
• Neck: Meningismus, nuchal rigidity

Neurologic Examination—Critical Components 1

Fundoscopic examination (most critical):

• Papilledema: Present in 60% of children with brain tumors 1
• Perform in every child with headache

Cranial nerves:

• Visual fields, extraocular movements, facial symmetry, hearing

Motor examination:

• Strength, tone, coordination (finger-to-nose, heel-to-shin)
• Gait assessment: Abnormal in many children with brain tumors 1

Reflexes:

• Deep tendon reflexes, plantar responses (Babinski sign)

Sensory examination:

• Gross sensory testing to light touch and pinprick

Cerebellar function:

• Dysmetria, dysdiadochokinesia, ataxia

Critical finding: 94% of children with brain tumors had abnormal neurologic findings at diagnosis 1. A completely normal neurologic examination makes serious secondary pathology highly unlikely.

Pathophysiology Framework

Primary Headaches

• Migraine: Neurovascular disorder involving trigeminovascular system activation, cortical spreading depression, and CGRP release
• Tension-type: Myofascial mechanisms, central sensitization

Secondary Headaches 1

• Increased intracranial pressure: Tumor, hydrocephalus, pseudotumor cerebri (idiopathic intracranial hypertension—more common in obese females but can occur in prepubertal children)
• Vascular: Hemorrhage, stroke, arteriovenous malformation
• Infection: Meningitis, encephalitis, sinusitis
• Trauma: Post-concussive syndrome
• Systemic: Hypertension, hypoxia, metabolic disorders

Differential Diagnosis by Presentation

Primary Headaches (90% of cases) 1

1. Migraine (55%)

   • Unilateral or bilateral, throbbing
   • 1-72 hours duration
   • Nausea/vomiting, photophobia/phonophobia
   • May have aura (visual most common)
   • Positive family history common

2. Tension-type (30%)

   • Bilateral, pressing/tightening quality
   • Mild to moderate intensity
   • No nausea/vomiting
   • No significant photophobia/phonophobia

3. Trigeminal autonomic cephalalgias

   • Rare in children but include cluster headache
   • Severe unilateral pain with ipsilateral autonomic features

Secondary Headaches (10% of cases) 1

1. Brain tumor with hydrocephalus (<1% of imaged children) 1

   • Morning headache, vomiting
   • Progressive symptoms
   • Abnormal neurologic examination in 94% 1

2. Pseudotumor cerebri

   • Papilledema without mass lesion
   • Visual symptoms
   • More common in obese patients 1

3. Infection

   • Fever, meningismus
   • Acute onset

4. Vascular disorders

   • Sudden onset, focal neurologic deficits

Diagnostic Workup Algorithm

No Red Flags + Normal Neurologic Examination

No imaging indicated 1, 2

• Diagnosis based on clinical criteria (International Headache Society)
• Neuroimaging has <1% yield for relevant findings 1
• Avoid unnecessary radiation exposure and incidental findings

Red Flags Present or Abnormal Neurologic Examination

MRI brain (preferred modality) 1:

• Indications:

  • Signs of increased intracranial pressure
  • Papilledema
  • Abnormal neurologic examination
  • Progressive or changing headache pattern
  • Age <3 years with concerning features

• Protocol: Start with non-contrast; add contrast if abnormality detected

• Note: May require sedation in children <6 years 1

CT head (limited role) 1:

• Emergency situations only:
  • Thunderclap headache (rule out subarachnoid hemorrhage)
  • Acute trauma
  • When MRI unavailable and urgent imaging needed
• Disadvantage: Radiation exposure, inferior soft tissue detail

Advanced vascular imaging (CTA, MRA, MRV, arteriography):

• No role in primary headache 1
• Reserved for suspected vascular pathology based on clinical presentation

Laboratory Studies

Not routinely indicated 2

• Consider if systemic illness suspected (infection, metabolic disorder)

Lumbar Puncture

Not routine 2

• Indicated for suspected meningitis/encephalitis or pseudotumor cerebri (after neuroimaging)

Management Approach

Primary Headaches

Lifestyle modifications (first-line for all):

• Regular sleep schedule (7-9 hours)
• Adequate hydration
• Regular meals (avoid skipping)
• Identify and avoid triggers
• Stress management
• Regular physical activity

Acute treatment for migraine:

• First-line: Ibuprofen 10 mg/kg or acetaminophen 15 mg/kg at headache onset
• Triptans: Consider in adolescents with severe migraine unresponsive to NSAIDs
• Antiemetics: For significant nausea/vomiting

Preventive therapy indications:

• ≥4 headache days per month with disability
• Inadequate response to acute treatment
• Medication overuse risk

Preventive options:

• Amitriptyline, topiramate, propranolol (most evidence)
• Cyproheptadine (younger children)
• Behavioral interventions: Biofeedback, cognitive-behavioral therapy

Secondary Headaches

Treatment directed at underlying cause 1:

• Tumor: Neurosurgical consultation, oncology referral
• Pseudotumor cerebri: Weight loss, acetazolamide, serial lumbar punctures
• Infection: Appropriate antimicrobial therapy
• Vascular lesions: Neurosurgical/interventional evaluation

Critical Pitfalls to Avoid

1. Over-imaging primary headaches: Creates anxiety, incidental findings, unnecessary radiation exposure 1

2. Misdiagnosing migraine as "sinus headache": 62% of pediatric migraineurs have autonomic symptoms mimicking sinusitis 1

3. Inadequate fundoscopic examination: Papilledema is present in 60% of children with brain tumors 1

4. Failing to assess gait: Gait disturbance is a common finding in children with intracranial pathology 1

5. Incomplete history in infants: Increased head circumference may be the only sign of increased ICP in first year of life 1

6. False reassurance from normal imaging: Clinical follow-up remains essential even with normal neuroimaging 3

7. Missing medication overuse headache: Frequent use of acute medications can perpetuate headache

The cornerstone of pediatric headache evaluation is thorough history and meticulous neurologic examination—not neuroimaging—as this approach identifies the <1% of children requiring intervention while avoiding unnecessary testing in the 90% with benign primary headaches 1.