What are the different types of syncope?

The type of syncope depends on what causes the problem:

• Vasovagal syncope / Cardio-neurogenic syncope This is the most common type of syncope. It is caused by a sudden drop in blood pressure, which causes a drop in blood flow to the brain. Some individuals with vasovagal syncope have a condition called orthostatic hypotension. This condition keeps the blood vessels from getting smaller (as they should) when the patient stands. This causes blood to collect in the legs and leads to a quick drop in blood pressure.
• Situational syncope Situational syncope is a type of vasovagal syncope that only happens during certain situations that affect the nervous system. Some of these situations are:
  • Dehydration
  • Intense emotional stress
  • Anxiety
  • Fear
  • Pain
  • Hunger
  • Use of alcohol or drugs
  • Hyperventilation
  • Urinating
• Postural syncope Postural syncope is caused by a sudden drop in blood pressure due to a sudden change in position, such as from lying down to standing. Certain medications and dehydration can also cause this type of postural syncope.
• Neurologic syncope This type of syncope is caused by a neurological condition such as seizures, strokes or other less common conditions like migraines.
• Postural Orthostatic Tachycardia Syndrome (POTS) T Postural orthostatic tachycardia syndrome is caused by tachycardia, which is a very fast heart rate. This happens when a person stands up after sitting or lying down.