Memory-loss cause #1: Chronic stress
Why it happens: When the body goes on hyperalert to face a crisis, a series of biochemical changes takes place that fuels the fight-or-flight response system. The chemical cortisol increases in the brain, for example, to mobilize energy and alertness. That's great when a saber-toothed tiger is chasing you. But when tension and anxiety become chronic, as with work or family problems, the system is overloaded with substances that are intended for emergency use only.
Causes of Memory Loss That Aren't Alzheimer's | Caring.com