Memory Problems



Most amnesia caused by damage to the brain. It may be due to an accident, an illness like a brain infection, stroke, or certain medicines. Sometimes the cause is not known.

Rarely, an emotional event can cause a problem called dissociative amnesia.

Risk Factors

Things that may raise the risk of amnesia are:

  • Head and brain injuries, such as from a car accident
  • Brain damage from problems like:
    • Alcohol or substance use disorders
    • Stroke
    • An illness that affects the brain, such as encephalitis
  • Complications from procedures such as:
  • Dementia or Alzheimer disease
  • Some medicines, such as those used as anesthesia
  • Certain changes in the body, such as changes in blood glucose levels or a lack of oxygen
  • Seizures
  • Recent physical or emotional pain or trauma
Areas of the Brain Affected by Dementia
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Symptoms of amnesia may be::

  • Problems remembering new or past information
  • Confusion
  • False memories


The doctor will ask about symptoms and past health. A physical exam will be done. The doctor will ask about the memory loss and when it started. A person with amnesia may not be able to answer these question. If not, a loved one or family member may answer for them.

To look for a cause, tests may be done such as:

  • A neurological exam
  • Blood tests to look for things like infections
  • Images of the brain may be taken to look for damage. This can be done with:
    • MRI scan
    • CT scan
    • Cerebral angiography
  • An EEG to test the brain’s electrical activity



Any cause of the amnesia will need to be treated. The problem may go away on its own. A therapist or support group may be needed for those whose amnesia does not go away.


There are no current guidelines to prevent amnesia.

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.

Edits to original content made by Denver Health.