CBD for Anxiety Disorders : Fear is the body’s instinctive defense against danger and is a normal part of our experience. Millions of years of evolution have hardwired the fight or flight response into the human brain. Intended to keep us alive, it does its job well. For many people, however, this ingrained reaction takes a wrong turn and turns into chronic anxiety. Panic attacks, stress, PTSD, and other mental health issues are the result.