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(example: head injuries), traumatic events (example: seeing something devastating to the mind), or physical deficiencies (example: atrophy of the hippocampus). The majority of amnesia and related memory issues derive from the first two categories as these are more common and the third could be considered a subcategory of the first.
* Head trauma is a very broad range as it deals with any kind of injury or active action toward the brain which might cause amnesia. Retrograde

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