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It depends upon whether they hit their head or not. A bump to the head can cause memory loss. Another cause of memory loss is stress or anxiety.
It can cause confusion in the short term. But it would not cause long term memory loss, unless there was some type of brain damage.
Amnesia, but Dementia and Alzheimer's also cause loss of memory.
Here you are more likely to suffer from mood swings then loss of memory.
One of them is earwax.
Moth ball fumes do not cause memory loss, but they have been reported to cause dazedness, erratic behavior, and other odd symptoms.