I was taking one aspirin every other day to prevent recurring tias . aspirin caused lightheadness . i cut back to 1- aspirin every 3-days symptoms much better now. My symptoms durring my tias were onset very quickly blood pressure dropping and total weakness,sweating and numbness,once i had total numbness top half of head. had a kinked vertabral arterie at c5,c6. had to have spinal fusion c5,c6,c7. still having tias.