Memory loss can have many causes:

• Alzheimer's disease is an illness which can cause mild to severe memory loss.
• Parkinson's disease is a genetic defect which may result in memory loss.
• Huntington's disease is an inherited disease which can result in memory loss.
• It is sometimes a side effect of chemotherapy in which cytotoxic drugs are used to treat cancer.
• Certain forms of mental illness also have memory loss as a key symptom, including fugue states and the much more famous Dissociative Identity Disorder.
• Stress-related activities are another factor which can result in memory loss.
• It can also be caused by traumatic brain injury, of which a concussion is a form.

[edit] See also

• Amnesia
• Memory and aging
• Memory bias

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