bleeding in the subarachnoid space, the area around the outside of the brain.
bleeding within the skull, between the arachnoid and pia membranes.
The Condition"...A subarachnoid hemorrhage also causes shifts in the level of electrolytes, especially sodium, in the blood..."
a catastrophic event that requires immediate and urgent medical attention
a serious, potentially life-threatening condition
The Condition"...Symptoms can include ... Nausea and vomiting..."