Secondary headache disorders — those resulting from underlying medical conditions — require recognition and targeted treatment of the underlying cause. Beyond migraine, tension, and cluster headache, neurologists frequently encounter post-traumatic headache, persistent post-LP headache, post-COVID headache, headache from venous sinus thrombosis, idiopathic intracranial hypertension (IIH), low-pressure (CSF leak) headache, medication-induced headache, and others. This page covers the major secondary headache syndromes and their pharmacotherapy.

Post-Lumbar Puncture (Post-LP) Headache

  • ~5-25% of LP procedures; positional (worse standing).
  • Pathogenesis: CSF leak through dural puncture site.
  • Risk factors: large needle, cutting (Quincke) needle, multiple attempts.
  • Prevention: atraumatic (pencil-point) needles, smallest gauge feasible, parallel orientation of bevel.

Treatment

  • Bed rest with horizontal positioning.
  • IV/oral fluid.
  • Caffeine: 300-500 mg IV or oral; helps in some.
  • Acetaminophen, NSAIDs for pain.
  • Epidural blood patch: gold standard for persistent or severe; ~70% success.
  • Theophylline: alternative caffeine-class.

Spontaneous Intracranial Hypotension / CSF Leak

  • Postural headache; can be debilitating.
  • Imaging: MR brain (sagging brainstem, pachymeningeal enhancement); spine MR for leak site.
  • Initial: conservative (rest, hydration, caffeine).
  • Epidural blood patch (lumbar) — first-line.
  • Targeted epidural blood patch at leak site (if identified).
  • Surgical repair if specific leak identified.

Idiopathic Intracranial Hypertension (IIH)

  • “Pseudotumor cerebri.”
  • Younger women, obesity association.
  • Papilledema (visual loss risk), headache, sixth nerve palsy, pulsatile tinnitus.
  • Imaging: empty sella, optic nerve sheath distension, slit ventricles.
  • LP: opening pressure >25 cm H₂O.

Treatment

  • Weight loss: most effective long-term.
  • Acetazolamide: 1-4 g/day; first-line pharmacotherapy.
  • Topiramate: alternative; weight loss benefit.
  • Methazolamide: alternative if acetazolamide intolerance.
  • Furosemide: adjunctive.
  • CSF shunt (VP, VA, LP) for refractory or visual loss.
  • Optic nerve sheath fenestration for visual loss.
  • Venous sinus stenting for venous outflow stenosis.

Cerebral Venous Sinus Thrombosis (CVT)

  • Severe headache; sometimes papilledema; sometimes focal symptoms.
  • Risk factors: pregnancy, OCs, thrombophilia, infection, dehydration.
  • Imaging: MR venography (or CT venography).
  • Acute: heparin (UFH or LMWH) regardless of hemorrhagic transformation.
  • Long-term: warfarin or DOAC (data emerging for DOAC use).
  • Duration: 3-12 months based on etiology.
  • Endovascular thrombolysis or thrombectomy for severe.

Subarachnoid Hemorrhage (SAH)

  • “Worst headache of life”; sudden onset; vomit; meningismus.
  • CT scan (within 6 hours: 100% sensitive).
  • LP if CT negative + high suspicion: xanthochromia, RBC.
  • CT angiography or DSA: identify aneurysm.
  • Treatment: aneurysm repair (clipping or coiling).
  • Vasospasm: nimodipine 60 mg PO q4h for 21 days; prevents delayed cerebral ischemia.
  • Hypertonic saline, “triple-H” therapy: vasospasm management.

Giant Cell Arteritis (GCA)

  • Elderly (>50); jaw claudication, scalp tenderness, vision changes.
  • ESR, CRP elevated.
  • Temporal artery biopsy: confirmatory.
  • Treatment:
    • High-dose steroids urgently (1 mg/kg prednisone, or methylprednisolone 1000 mg IV × 3 days for vision threat).
    • Slow taper over 1-2 years.
    • Tocilizumab (Actemra): anti-IL-6R; FDA-approved; steroid-sparing.
    • Aspirin 81 mg daily (reduces stroke).
    • Bone density management on chronic steroids.

Brain Tumor Headache

  • Headache with: vomiting (especially morning), focal symptoms, papilledema, seizures.
  • Imaging: MR brain with contrast.
  • Treatment: dexamethasone for edema; tumor-specific therapy.

Hypertensive Headache

  • Severe HTN can cause headache.
  • Acute BP lowering: labetalol IV, hydralazine, nicardipine.
  • Long-term BP control.

Post-Traumatic Headache

  • After concussion or TBI.
  • Phenotype often migrainous.
  • Treatment: migraine acute and preventive approaches.
  • Topiramate, amitriptyline often used.
  • Rest + gradual return to activity.

Post-COVID Headache

  • Emerging entity.
  • Can have new daily persistent headache pattern.
  • Treatment: migraine approaches; some respond to amitriptyline, topiramate, anti-CGRPs.
  • Greater occipital nerve block: useful in some.

Headache Attributed to Substance Use

  • Withdrawal: caffeine, opioids, benzodiazepines.
  • Intoxication: alcohol, cocaine, amphetamines.
  • Medication-induced: nitrates, calcium channel blockers, oral contraceptives.
  • Treatment: address underlying substance issue.

Sleep-Related Headache

Hypnic Headache

  • Older adults; wakes from sleep.
  • Lithium: most effective.
  • Caffeine at bedtime.
  • Indomethacin.

Sleep Apnea Headache

  • Morning headache.
  • CPAP treatment of OSA.

Trigeminal Autonomic Cephalalgias (Beyond Cluster)

Paroxysmal Hemicrania

  • Short attacks; multiple daily; absolute response to indomethacin (diagnostic).
  • Indomethacin 75-225 mg/day.

SUNCT/SUNA

  • Brief attacks with autonomic features.
  • Lamotrigine first-line; topiramate alternative.
  • Gabapentin, oxcarbazepine.

Hemicrania Continua

  • Continuous unilateral headache with autonomic features.
  • Absolute indomethacin response (diagnostic).

Cough / Exertional / Sexual Headache

  • Indomethacin: often effective.
  • Beta-blockers: exertional, sexual.
  • Rule out structural causes (Chiari, SAH, vascular).

Trigeminal Neuralgia

  • (See preventive page.)
  • Carbamazepine first-line.
  • Surgical options for refractory.

Reversible Cerebral Vasoconstriction Syndrome (RCVS)

  • Thunderclap headaches recurrent.
  • Vasoactive triggers: cocaine, SSRIs, triptans, vasoactive substances.
  • Imaging: “string of beads” cerebral arteries.
  • Treatment: remove trigger; nimodipine; supportive.
  • Resolves within 3 months in most.

New Daily Persistent Headache (NDPH)

  • Daily headache from onset (no prior history).
  • Often refractory.
  • Treatment: migraine approaches; behavioral; sometimes resolves spontaneously.

Headache Red Flags (“SNOOP”)

  • S: systemic symptoms (fever, weight loss, autoimmune disease).
  • N: neurologic deficits (other than typical aura).
  • O: onset sudden (“thunderclap” — SAH).
  • O: older age (>50, new headache: GCA).
  • P: pattern change (new pattern in established headache disorder).
  • Also: positional, papilledema, pregnancy, immunocompromised.

🔍 Did You Know?

The recognition that spontaneous intracranial hypotension (SIH) can present as an often-missed cause of disabling postural headache has revolutionized the approach to chronic headache in some patients. Previously dismissed as functional or “tension-type” headache, SIH is now understood to result from spontaneous CSF leaks through structural defects in the spinal dura. The clinical presentation classically involves positional headache (worse standing, better lying), sometimes with tinnitus, hearing changes, neck pain, or nausea. The breakthrough diagnostic insight was that MR brain with contrast can show specific findings — pachymeningeal enhancement, sagging brainstem, distended dural venous sinuses, subdural fluid collections — that point to the diagnosis. CT myelography or dynamic CT myelography can identify the specific leak site, often a CSF-venous fistula or dural tear. The treatment evolved from purely conservative (rest, fluids, caffeine) to epidural blood patches (often multiple), increasingly targeted at the leak site, and surgical repair for refractory cases. For practicing neurologists, the clinical pearl is profound: any patient with new postural headache deserves evaluation for SIH, particularly if conventional approaches fail. The lesson generalizes: specific structural causes underlie many “idiopathic” syndromes, and persistent investigation with appropriate imaging can yield definitive diagnoses and effective treatments. SIH was once considered rare; it is now recognized to be more common than previously appreciated, particularly in middle-aged adults.

Pitfalls and Pearls

  • Red flags (SNOOP): systemic, neurologic, onset, older, pattern change.
  • Post-LP headache: epidural blood patch for severe; caffeine; atraumatic needles for prevention.
  • SIH: positional headache; MR brain (pachymeningeal enhancement, sagging brainstem); epidural blood patch.
  • IIH: acetazolamide first-line; weight loss most effective.
  • CVT: anticoagulation even if hemorrhagic transformation; LMWH then warfarin or DOAC.
  • SAH: nimodipine 60 mg q4h × 21 days for vasospasm.
  • GCA: high-dose steroids urgently; tocilizumab steroid-sparing.
  • Hypnic headache: lithium.
  • Paroxysmal hemicrania: indomethacin absolute response (diagnostic).
  • SUNCT/SUNA: lamotrigine.
  • Hemicrania continua: indomethacin absolute response.
  • RCVS: thunderclap headache + cerebral vasoconstriction; nimodipine.
  • Post-COVID headache: migraine approaches; greater occipital nerve block.
  • Brain tumor: dexamethasone for edema.
  • Trigeminal neuralgia: carbamazepine first-line.
  • Always rule out secondary causes in new or changing headache.

References

  1. Schievink WI. Spontaneous spinal cerebrospinal fluid leaks and intracranial hypotension. JAMA. 2006;295(19):2284-2296.
  2. Friedman DI, Liu GT, Digre KB. Revised diagnostic criteria for the pseudotumor cerebri syndrome in adults and children. Neurology. 2013;81(13):1159-1165.
  3. Saposnik G, Barinagarrementeria F, Brown RD Jr, et al. Diagnosis and management of cerebral venous thrombosis: a statement for healthcare professionals from the American Heart Association/American Stroke Association. Stroke. 2011;42(4):1158-1192.
  4. Hellmann DB. Giant cell arteritis. JAMA. 2002;287(1):92-101.
  5. Cordenier A, De Hertogh W, De Keyser J, Versijpt J. Headache associated with cough: a review. J Headache Pain. 2013;14(1):42.
  6. Ducros A. Reversible cerebral vasoconstriction syndrome. Lancet Neurol. 2012;11(10):906-917.