Criteria that suggest an acute migraine rather than subarachnoid haemorrhage (SAH): Rule-in criteria: "P0UND" Pulsating One-day duration (in practice, 4-72 hours) Unilateral location Nausea or vomiting Disabling intensity Rule-out criteria: "SUM IT UP" Sudden onset Unlike previous Maximal at onset Strongly and reliably consistent with subarachnoid haemorrhage: > 40 year old with neck pain or … Continue reading Acute, Severe Headache