Secondary Headache

Secondary Headache is a comprehensive clinical decision support and reference app covering all major secondary headache disorders encountered in neurology, emergency medicine, and general practice. Designed for neurologists, emergency physicians, trainees, and medical students, the app provides structured clinical guidance for 24 conditions across 6 categories — from life-threatening emergencies to outpatient presentations. SNOOP4 RED FLAGS A dedicated SNOOP4 red flag screening tool is built into the home screen — always screen for secondary causes before attributing headache to a primary disorder. CONDITIONS COVERED: Vascular — Life-Threatening (EMERGENCY): - Subarachnoid Haemorrhage — thunderclap, CT then LP, nimodipine - Cerebral Venous Sinus Thrombosis — postpartum, anticoagulate even with haemorrhagic infarction - Carotid / Vertebral Artery Dissection — Horner syndrome, neck pain, young patient - Hypertensive Emergency — PRES, end-organ damage, target SBP reduction - RCVS — recurrent thunderclap, postpartum, vasoconstriction on angiography Intracranial Pressure (URGENT): - Idiopathic Intracranial Hypertension — papilloedema, pulsatile tinnitus, acetazolamide - Brain Tumour Headache — progressive, morning worsening, dexamethasone - Brain Abscess — fever, focal signs, ring-enhancing lesion - Hydrocephalus — VP shunt malfunction, Parinaud syndrome Infection & Inflammation (EMERGENCY/URGENT): - Meningitis — treat before LP, dexamethasone with first antibiotic dose - Encephalitis — IV aciclovir immediately, autoimmune panel - Giant Cell Arteritis — age >50, jaw claudication, IV methylprednisolone for visual symptoms - Sinusitis-Related Headache — facial pain, purulent discharge, decongestants CSF Pressure Disorders: - Post-Dural Puncture Headache — postural, epidural blood patch - Spontaneous Intracranial Hypotension — orthostatic, pachymeningeal enhancement - CSF Flow Obstruction — colloid cyst, positional thunderclap Structural & Cervicogenic: - Cervicogenic Headache — C1-C3, restricted ROM, GON block - Chiari Malformation — Valsalva-provoked, downbeat nystagmus - Craniocervical Junction Disorders — atlantoaxial instability, occipital neuralgia Medication & Metabolic: - Medication Overuse Headache — >15 days/month analgesics, withdrawal protocol - Carbon Monoxide Poisoning — multiple affected, hyperbaric oxygen - Hypotension / Dialysis Headache — orthostatic, autonomic failure - Sleep Apnoea Headache — morning headache, CPAP FEATURES: - SNOOP4 red flag screening tool - Urgency colour coding — Emergency / Urgent / Semi-urgent / Outpatient - 7 structured tabs per condition: Overview · Red Flags · History · Examination · Investigations · Management · References - Interactive history and examination checklists - Tappable guideline references — NICE, ESO, BSR, EAN, IDSA - Works fully offline — no login required - ICHD-3 classification based Content based on NICE, British Society of Rheumatology (BSR), European Academy of Neurology (EAN), European Stroke Organisation (ESO), Royal College of Physicians (RCP), and major international guidelines. IMPORTANT: Secondary Headache is intended as a clinical reference aid for qualified healthcare professionals only. It does not replace clinical judgement, local guidelines, or senior review. Always follow your institution's protocols and seek senior advice when appropriate.