2. Fainting is a Major Symptom
The most common types of dysautonomia are called neurocardiogenic syncope, which are commonly associated with fainting. The Pediatric Cardiology Center of Oregon explains this condition is cause by a drop in blood pressure, “quickly followed by faster then slower heart rate resulting in poor blood and oxygen flow to the brain which results in temporary loss of consciousness.”
This usually occurs when standing, but can even happen when a patient is sitting down, explains the site. Other causes of neurocardiogenic syncope are stressful situations, motionless standing, dehydration, sleep deprivation, and even hot weather, adds the source.