Everyone occasionally experiences forgetfulness. Mild memory loss tends to increase with age and is generally no cause for concern. But progressive memory loss due to illnesses like Alzheimer’s disease can be serious.
Whether it's occasional forgetfulness or loss of short-term memory that interferes with daily life, there are many causes of memory loss
CAUSES
vitamin B-12 deficiency
sleep deprivation
use of alcohol or drugs and some prescription medications
anesthesia from recent surgery
cancer treatments such as chemotherapy, radiation, or bone marrow transplant
head injury or concussion
lack of oxygen to the brain
certain types of seizures
brain tumor or infection
brain surgery or heart bypass surgery
mental disorders such as depression, bipolar disorder, schizophrenia, and dissociative disorder