Bumped head on small open cupboard door. could something like this cause a concussion or tbi for me? was worried because i had one before this.

Concussion ?: I am not sure if something like this cause a concussion or tbi . It could be minor head trauma . Did you loose your conciousness ? Did you have any memory loss of the events before the bumping your head or after bumping your head? If the answers are yes you had a concussion if the answers are no you had a minor head trauma and you do not need an mri but an observation for a while by your doctor.