The Autonomic Nervous System (ANS)
Stress is one of the most common triggers for FND symptoms. To understand why, we have to look at the Autonomic Nervous System—the part of your brain that controls involuntary functions like heart rate, breathing, and the "Fight or Flight" response.
Sympathetic Overload
The 'Fight or Flight' mode. When this is chronically active, it Increases the "precision weighting" of internal body signals, making the brain more likely to trigger an FND response.
Parasympathetic Shutdown
The 'Freeze' response. In conditions like functional paralysis or PNES, the brain may enter a "freeze" state to protect the person from perceived threat.
Stress ≠ "Just Stressed"
In FND, when we talk about stress, we don't just mean "feeling worried." We mean Physiological Stress—the body's chemical and electrical state. Your body can be in a state of high stress even if your mind feels calm.
The Internal Volume Control
Biological Vulnerability
Some people have a nervous system that is naturally more sensitive or "reactive" to stress. This biological trait, combined with a trigger (like a physical injury), can lead to the "perfect storm" that results in FND.
Management Strategies
Because the ANS is so involved, therapies that focus on Relaxation, Breathing, and Nervous System Regulation are often very effective in reducing the frequency and severity of FND symptoms.