Is it possible to cure memory loss.? and can a head injury cause memory loss? even if the mri scans are clear.

Improvement, yes: Cure is not the best way to think of it, but yes - some memories might return and new memories may be unaffected. A head injury can certainly involve a short time period from which memories are impaired. It is not necessary to suffer tissue damage that would show in imagery and there could also be some PTSD-type psychological trauma involved that can disrupt memory. Don't add to it w/ worry. Best

Head injury: Head injuries can cause memory loss, which can be temporary. MRI scan may not show any abnormality.