Why Do People Faint with Dysautonomia?

People with dysautonomia may experience fainting or near-fainting episodes, also known as syncope, for several reasons. Here are some possible explanations:

Orthostatic Hypotension

Orthostatic hypotension is a common problem in people with dysautonomia. It occurs when blood pressure drops upon standing up, causing a decrease in blood flow to the brain and other organs. The body's autonomic nervous system is responsible for maintaining blood pressure and heart rate, but in people with dysautonomia, this system may not function correctly, leading to orthostatic hypotension.

Neurally Mediated Hypotension

Neurally mediated hypotension (NMH) is another type of low blood pressure that can occur in people with dysautonomia. NMH is triggered by a sudden, excessive response of the autonomic nervous system to a particular stimulus, such as emotional stress, pain, or prolonged standing. This response can cause blood vessels in the legs to dilate, leading to a sudden drop in blood pressure and decreased blood flow to the brain.

Vasovagal Syncope

Vasovagal syncope is a type of fainting episode that can occur in response to certain triggers, such as the sight of blood or intense emotional stress. It is caused by a sudden activation of the vagus nerve, which is part of the autonomic nervous system. This activation can lead to a drop in blood pressure and heart rate, resulting in fainting.

Other Causes

There are several other potential causes of fainting in people with dysautonomia, including medication side effects, dehydration, and heart rhythm problems.

If you experience fainting or near-fainting episodes, it's essential to talk to your doctor to determine the underlying cause and develop an appropriate treatment plan. Treatment for fainting episodes may include lifestyle changes, medication, and/or other interventions aimed at managing the underlying dysautonomia condition.