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(Memory Loss)


Amnesia is when a person cannot recall new information or past events. It may go away in a short time or be lasting.


Most memory problems are 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 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


A person may have:

  • Problems recalling new or past information
  • Confusion
  • Disorientation
  • False memories


You will be asked about your symptoms and health history. The doctor will ask about your memory loss and when it started. A loved one or family member may answer these questions if the person cannot.

These tests may be done to look for a cause:

  • A physical and 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:
  • An EEG to test the brain’s electrical activity


Any cause 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 this problem.


American Academy of Neurology

Family Doctor—American Academy of Family Physicians


Canadian Neurological Sciences Federation

Health Canada


Amnesia. Better Health Channel website. Available at: https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/amnesia. Accessed September 4, 2020.

Amnesias. Merck Manual Professional Version website. Available at: https://www.merckmanuals.com/professional/neurologic-disorders/function-and-dysfunction-of-the-cerebral-lobes/amnesias. Accessed September 4, 2020.

Kirshner HS. Transient global amnesia: a brief review and update. Curr Neurol Neurosci Rep. 2011 Dec;11(6):578-582.

Memory loss (amnesia). NHS Choices website. Available at: https://www.nhs.uk/conditions/memory-loss-amnesia. Accessed September 4, 2020.

Transient global amnesia. EBSCO DynaMed website. Available at:https://www.dynamed.com/condition/transient-global-amnesia. Accessed September 4, 2020.

Transient global amnesia. Merck Manual Professional Version website. Available at: https://www.merckmanuals.com/professional/neurologic-disorders/function-and-dysfunction-of-the-cerebral-lobes/transient-global-amnesia. Accessed September 4, 2020.

Treating amnesia. Brain & Life—American Academy of Neurology website. Available at: https://www.brainandlife.org/the-magazine/article/app/4/4/20. Accessed September 4, 2020.

Last reviewed March 2020 by EBSCO Medical Review Board Adrian Preda, MD  Last Updated: 2/19/2021