When you have amnesia you can't remember what happened to you in the past. Amnesia is a total or partial memory loss.

Some causes of amnesia are brain injury, disease, drug or alcohol abuse, and the deterioration of the brain associated with old age or dementia. With amnesia, memory can be regained, or it can be lost forever. It can be complete, encompassing everything you ever knew, or it can be specific to a time such as the hours leading up to an accident or trauma. If you forget the meaning of a word, it's not amnesia, that's just the way the mind works sometimes.

Definitions of amnesia
  1. noun
    partial or total loss of memory
    synonyms: blackout, memory loss
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    anterograde amnesia, posttraumatic amnesia
    loss of memory for events immediately following a trauma; sometimes in effect for events during and for a long time following the trauma
    retrograde amnesia
    loss of memory for events immediately preceding a trauma
    tendency to forget
    selective amnesia
    amnesia about particular events that is very convenient for the person who cannot remember
    transient global amnesia
    memory disorder seen in middle aged and elderly persons; characterized by an episode of amnesia and bewilderment that lasts for several hours; person is otherwise alert and intellectually active
    senior moment
    a momentary lapse of memory (especially in older people)
    posthypnotic amnesia
    selective amnesia after being in a hypnotic state of events occurring during hypnosis or of information designated by the hypnotist
    type of:
    cognitive state, state of mind
    the state of a person's cognitive processes
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