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Fever + Headache (Main presenting symptom (23yo male (med student), 1d…

- - - - Intracranial
        
        stiff neck, consider
        
        Meningitis
        
        altered mental status/seizures, consider
        
        Encephalitis
        
        consider
        
        Brain abscess (bacterial, fungal, parasitic)
        
        stiff neck + altered mental status/seizures, consider
        
        Meningoencephalitis
    - - Systemic
        
        includes
        
        Viral syndromes
        
        Dengue Fever
        
        Infectious mononucleosis
        
        HIV (primary infection)
        
        Norovirus infection
        
        Common cold
        
        Lyme disease
        
        RMSF
        
        Influenza
    - - Focal
        
        Tender sinuses/ nasal obstruction, consider
        
        Sinusitis
        
        orbital cellulitis complication
        
        pharyngitis
        
        Bacterial (streptococcal)
        
        Viral
        
        Tuberculosis
- - - - CNS
        
        Intracranial
        
        Bleeding
        
        subarachnoid hemorrhage
        
        Brain tumour
        
        Stroke
        
        Trauma
        
        Extracranial
        
        Carotid/vertebral dissection
        
        Arteriovenous malformation
        
        Giant cell arteritis
    - - Systemic
        
        Autoimmune
        
        SLE
        
        Sarcoidosis
    - - Drugs/toxins
        
        Alcohol/recreational drug withdrawal
        
        Medication
        
        CO poisoning