The other day I got a silly paper cut on my finger. It oozed blood a little, and just for a second, because I grabbed a paper towel to wipe the blood away. This got me thinking. My poor brain bled after my injury with no place to go, so it just swelled. The most damage happened from this swelling. I feel so lucky that I got medical attention quickly because if the swelling went on any longer...well, we won't go there.
(I hope I explained this correctly. It makes sense in my mind). Read the below link for a better explanation: