What is it ?
One of the most common causes of fainting is called neuro-cardiogenic syncope also called vasovagal syncope. This condition is not really a disease but an abnormal reaction that results in a fall in blood pressure. The blood pressure may become so low that a person may experience light-headedness or fainting. The abnormal reaction that causes neurocardiogenic syncope may be brought on by pain, or anxiety, although frequently, this may occur without a trigger. Because there are other causes for syncope, your doctor may advise you to undergo head-up tilt testing to confirm the diagnosis. Because an episode of syncope may lead to serious injury, this test is important to diagnose the condition and, if necessary, treat it with medications and other regular daily practices, such as tilt training that will reduce your symptoms.

Head -up tilt testing is a way to safely diagnose neuro-cardiogenic syncope by deliberately creating the symptoms of neuro-cardiogenic syncope in a special room called an electrophysiology (EP) lab.