<s>[INST] I had a concussion a year ago, car accident. I just had a stroke. No damage. I am male, 55, 6 tall, 195lbs. No blocked arteries. I ve been a runner my whole life, training to compete in Worlds Master meet in Sacramento, CA in July. Could that concussion have caused me to have a stroke. [/INST] Hi ThereThe chances of having stroke due to concussion are very small and also there are no studies still that prove a direct strong relationship among the two.However what happen after traumatic injury to brain is some people develop Hypertension which if left unattended could finally land in stroke.Wish you Good Luck </s>