Correlation does not equal causation. Surely mild brain damage can occur during blows to the head that do not meet the concussion protocol, but attributing this to sneezing or even most forms of headbanging (some people are too intense) is stretching it a bit.
Btw, I have a degree in biochemistry, am an active EMT, and studying to become a PA. If you are aware of better sources to support your claims, I will be happy to see them. I dont think anyone in medicine claims to be the purveyor of absolute certainty, so I will concede in light of concrete evidence. As it stands, I do not believe brain tissue to be quite as weak as you are implying.
you have a degree in biochemistry, yet you dont think ischemic events lead to brain cell death???