<prompt> All of the following cause metabolic headache except:HypoxiaHypercapniaHyperglycemiaHyponatremia  <response>: Hypoxia Causes cerebral vasodilation -- headache. Hyperglycemia Hyperglycemia does not present as headache Hypercapnia Cause cerebral vasodilation and stretching of meninges. Hyponatremia Cerebral edema leads to a headache and seizures. 