Brain artery blockage is a full stop in one of the brain’s supply pipes. A clot or plug shuts the lane, and the area downstream runs out of oxygen within minutes. Signs show up fast, often without any warning headache. The first clue is instant face droop. One corner of the mouth falls, the eyelid sags, and the whole side seems to melt. Ask for a smile—you get a crooked grin or none at all. Arm drift hits next. Raise both arms and one drops like a rock or floats down slowly. The hand may tingle or feel dead, and... Learn more