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Headache associated with increased intracranial pressure (ICP) represents a potentially life-threatening neurological emergency requiring immediate evaluation and intervention. This type of headache typically presents with distinct characteristics including morning predominance, worsening with Valsalva maneuvers, and association with neurological symptoms such as nausea, vomiting, and altered mental status.
Increased ICP occurs when the volume of brain tissue, cerebrospinal fluid, or blood exceeds the cranium's capacity to accommodate expansion, violating the Monro-Kellie doctrine. This elevation in pressure compromises cerebral perfusion, reduces cerebral blood flow, and can lead to brain herniation syndromes if untreated. Common causes include mass lesions, cerebral edema, hydrocephalus, and intracranial hemorrhage.
Recognition of ICP-related headaches requires careful assessment of headache characteristics, associated symptoms, and neurological examination findings. The presence of papilledema, focal neurological deficits, or altered consciousness alongside headache should prompt immediate neuroimaging and neurosurgical consultation. Early identification and treatment are crucial to prevent irreversible brain damage and death from herniation syndromes.
Key imaging focus: Red flags (thunderclap, worst ever, focal deficit); normal CT doesn't rule out everything