Basilar artery stenosis means the main brain-stem highway is slowly clogging. Trouble often comes in short waves before a bigger hit. The first red flag is sudden bilateral weakness—both legs or all four limbs feel heavy, rubbery, or give out for seconds to minutes. Vision can dip in both eyes at once, like a curtain falling, or merge into double sight. Some people describe “gray fuzz” that clears when they sit still. Dizziness flashes on with head turns or standing up fast. The room doesn’t spin, but you sway as if on a boat and grab walls to stay upright.... Learn more