Several medical conditions can contribute to memory problems. Talk to your doctor if your memory declines, and seek immediate medical attention if you experience sudden, severe memory loss, with or without other symptoms like difficulty speaking or understanding speech, headache and confusion.
Here's some interesting info about memory and types of memory problems.
Bow-tie pasta with walnuts and asparagus...3 brain-boosting ingredients!
Anatomy of this progressive, irreversible neurological disorder