High Headache Within 1 Min For the first time, headache, which is very severe and reaches its highest intensity in about 1 minute, can be a harbinger of subarachnoid hemorrhage. Subarachnoid hemorrhage occurs due to rupture of aneurysms, which may be described as ballooning due to anomaly in the brain vessel walls. Headache may be … Continue reading High Headache Within 1 Min