A knock or blow to the head can cause a crack in the skull thru which brain matter can exit the head.
A severe shock like seeing a grown woman wearing what appear to be a pile of rags as Ilhan Omar does can concuss you which will cause problems with concentration, memory, balance and coordination.
Concussions are usually caused by a blow to the head. Violently shaking the head from side to side is a non-verbal way to say no which is what caused Omar’s concussion. A concussion can cause a migraine headache which explains the Effect of Ilhan, a set of cultural mistakes.