What are some common causes of sudden memory loss?
Sudden memory loss sometimes occurs immediately following an insult to the brain, such as a severe head injury or a stroke, says WebMD. Head injuries often cause short-term and long-term memory loss, which may improve over time. Alternatively, strokes often cause only short-term memory loss, which is due to blocked blood flow or bleeding in the brain. Medications, such as antidepressants, sleeping pills and pain medicines, also frequently interfere with memory, as does a deficiency of vitamin B-12 or vitamin B-1. Excessive alcohol use also frequently causes memory loss.
Sources: webmd.com, mayoclinic.org, mayoclinic.org