I have been reading through the forums and research on how the brain is hyper-sensitive to hits after a concussion. I am wondering how sensitive is the average brain after or during PCS, basically I am asking how careful I should be.

For example, I have been reading research on how heading a soccer ball can be considered a subconcussive impact. If I were to head a soccer ball while having PCS, could it potentially be a concussive impact? Or would it not cause any new damage and aggravate the already present damage? Obviously I'm not going to head a soccer ball, but I'm just curious.

Like I tried running a few months ago and got a very bad headache, but nowhere have I found research saying that running could damage the brain. Would this mean that it is a blood pressure thing?

THanks.