Andrew Huberman· PhD
if there's even a slight bit of swelling in the brain or even distant brain tissue so for instance even if the there's Whiplash so there's swelling of the tissue muscular tissue and neural tissue in the neck area that can constrict the flow of things like cerebral spinal fluid blood flow and indeed mucus and other other things that are essential we all hear mucus and we think Illness but mucus is a vital vital substance within the body for a lot of important reasons in health as well as in sickness well if there's less of that liquid and other fluids and mucus being delivered to that space well then it can clog up so sort of the plumbing is clogged up or that it's caught at the level of the site of hit or injury because there's some local swelling and inflammation there so there are many different mechanisms that can underlie headache associated with head hits or traumatic brain injury