A vasovagal reaction (also called vasovagal syncope) is sudden
dizziness or fainting that can be triggered by pain, fright, or trauma. The
person may sweat, feel lightheaded, nauseated, or tingly, and may pass out if
the reaction continues.
A vasovagal reaction can happen without serious cause. However,
vasovagal reactions may be caused by heart problems, epilepsy, or other
conditions that require treatment.
A vasovagal reaction can usually be relieved by lying down with the
legs elevated. However, treatment is necessary if a medical condition is
causing the vasovagal reaction.
