Unveiling Dysautonomia: Symptoms, Causes, and Types

9. Familial Dysautonomia

Also called Riley-Day syndrome, familial dysautonomia is an extremely rare genetic mutation that causes nerve cells to develop improperly or die. Fewer than 500 people worldwide have FD. Most people have symptoms such as the absence of tears or tear secretion, or a decreased ability to feel pain or to sweat. Health care providers use a genetic testing registry to diagnose this condition and come up with possible treatment and management options.