Amnesia refers to the loss of memories, such as facts, information and experiences. Amnesia can be caused by damage to areas of the brain that are vital for memory processing. Antergrade amnesia means that a person has difficulty learning new information following the onset of amnesia. Retrograde amnesia is when a person has difficulty remembering past events and previously familiar information. Unlike a temporary episode of memory loss (transient global amnesia), amnesia can be permanent. Summary is from https://www.mayoclinic.org/diseases-conditions/amnesia/symptoms-causes/syc-20353360?p=1
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