What are symptoms of blocked carotid arteries?

None,Stoke,Paralysis. Typically not blocked; narrowed to various degrees by advanced artery disease, plaque ruptures & clots (which either shed downstream +/- scar down in place creating narrowings). Artery ds typically begins in childhood, arteries enlarge & ds asymptomatic for decades, until plaque ruptures induce clots, damage, narrowing, closure. Always look at images, judge for yourself, not that hard & u'r body.