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Textbook/Neurology/Idiopathic intracranial hypertension/Rapid
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Idiopathic intracranial hypertension

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2 min synopsisUK scopeSources checked 27 Aug 2026Clinical review pending
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Escalate

Papilloedema with rapidly worsening acuity or visual fields, severe hypertension, altered consciousness, focal deficit or an acute atypical headache requires urgent same-day hospital, ophthalmology and neurology assessment. Fulminant visual decline may need emergency cerebrospinal-fluid diversion or optic-nerve-sheath surgery; repeated outpatient lumbar puncture is not an adequate vision-saving plan.

Synopsis

Confirm raised intracranial pressure safely after excluding secondary causes, protect vision through structured ophthalmic monitoring, and use weight, medicine or surgery according to visual risk.

  • Idiopathic intracranial hypertension is raised intracranial pressure with normal cerebrospinal-fluid composition and no mass, hydrocephalus, venous thrombosis or other secondary cause on appropriate investigation.
  • Headache is common but non-specific; papilloedema, transient visual obscurations, pulsatile tinnitus and sixth-nerve palsy provide more diagnostic and risk information.
  • Confirm suspected papilloedema with competent ophthalmic assessment, documenting visual acuity, pupils, formal visual fields and optic-disc appearance or imaging.

Key red flags

Papilloedema syndrome

Bilateral optic-disc swelling with transient visual obscurations, headache or pulsatile tinnitus raises intracranial-pressure concern and needs urgent competent visual assessment.

Investigation priorities

01
Formal ophthalmic assessmentFirst step

Confirm papilloedema and establish visual acuity, pupils, colour, perimetry, fundus grade and optic-nerve imaging baseline.

Management branches

Suspected papilloedemaProtect sight while confirming pressure

Disc swelling or pressure-related visual symptoms are identified.

  1. Measure blood pressure, acuity, pupils and fields urgently, obtain experienced confirmation of papilloedema and identify rapidly changing vision.
  2. Arrange urgent brain imaging with venography to exclude mass, hydrocephalus and cerebral venous sinus thrombosis before lumbar puncture.
Stable visionModify disease and monitor function

IIH is confirmed without rapidly deteriorating visual function.

Key medicines

AcetazolamideA common specialist start is 250–500 mg twice daily, titrated according to visual response, adverse effects, renal function and the local IIH protocol.
TopiramateIf selected by a specialist, begin at a low nightly dose and titrate slowly using migraine guidance and the lowest effective tolerated regimen.
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Sources and review status5 sources · checked 27 Aug 2026 · clinical review pending
Sources

Sources and review status

National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.

Authoring stateRapid draftClinical stateAwaiting reviewJurisdictionUnited Kingdom