Intracranial pressure (ICP) is the pressure inside the skull: in brain tissue and CSF.

Raised ICP signs/symptoms include headache (particularly morning headache - the headache is worse with coughing, sneezing and bending, and progressively worsens over time), vomiting, altered level of consciousness, and papilloedema.

ICP is normally 7–15 mmHg. At 20–25 mmHg (the ULN), treatment to reduce ICP may be needed (such as therapeutic LP).

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