“…The latter can lead to blunting of consciousness via hyponatremia, myxedema, and/or hyperglycemia. 21,22,30,70,71,87,88 Sudden-onset severe headache ("thunderclap" headache) is the most common presenting symptom of PA (95-100%), 1,3,10,12,14,16,19,20,36,45,46,59,64,[67][68][69]71,73,75,[79][80][81][82][83][84][85]89,90 followed by nausea (80%), visual deficits (71-82%), 3,85 and vomiting (69%). 16 Headache is the usual cause for hospital referral.…”