The vagus nerve can cause dizziness or fainting when blood pressure drops suddenly. Learn why this happens, how it is called vasovagal syncope, and what it means for nervous system health.

Your brain rapidly interprets information it receives from your eyes, pressure sensations in the feet, sounds, and information from the vestibular system to determine its position in space. Of these systems, the vestibular system is the most critical. Without it, you are likely to experience dizziness, nausea, and you may not be able to stand or walk depending on the severity.