Concussions are head injuries. They can and will cause memory loss...so if you've had several concussions, there is a good chance that your memory loss was caused by, or partly caused by them. You should mention this to your doctor next time you have an appointment.
I can't really remember anything about my life and I'm not sure why. I've had concussion 3 or 4 times in the past. Could that have had an impact on my memory? Is this normal?
I have memory loss too, they say when your aware of it that's good the thing is if you can't remember it then you have problems.