Amnesia is a type of memory loss that affects your ability to make, store, and retrieve memories.
Retrograde amnesia affects memories that were formed before the onset of amnesia. Someone who develops retrograde amnesia after a traumatic brain injury may be unable to remember what happened in the years, or even decades, prior to that injury.
Retrograde amnesia is caused by damage to the memory-storage areas of the brain, in various brain regions. This type of damage can result from a traumatic injury, a serious illness, a seizure or stroke, or a degenerative brain disease. Depending on the cause, retrograde amnesia can be temporary, permanent, or progressive (getting worse over time).
Example: someone might forget whether or not they own a car, what type it is, and when they bought it — but they will still know how to drive.
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