blood can also swirl around there and form a clot so when somebody comes in with a stroke we're thinking about let's take a look at the blood vessels and look for atherosclerosis let's take a look at the heart and see if we've got something going on with the heart that could predispose to a clot formation and if that's not the cause then you can start thinking about the blood right what if the blood gets too sticky for some reason sticky blood could form a blood clot and the blood clot then could cause a stroke so a variety of causes