Vasovagal syncope: This is the most common cause of syncope and occurs due to a sudden drop in heart rate and blood pressure in response to triggers such as pain, emotional stress, or dehydration.

Cardiac syncope: This occurs due to a problem with the heart, such as an abnormal heart rhythm or a heart valve problem.

Neurological syncope: This occurs due to a problem with the nervous system, such as epilepsy or a transient ischemic attack (TIA).

Orthostatic hypotension: This occurs when a person experiences a sudden drop in blood pressure when standing up, leading to dizziness or fainting.