Collocations for concussion - noun

mild, minor, slight
bad, major, serious, severe

get, have, suffer, sustain
She suffered mild concussion. (BrE)
Doctors said he suffered a concussion during the football game. (AmE)

with concussion
He was carried off the field with mild concussion. (BrE)
He was carried off the field with a mild concussion. (AmE)