Syncope, the medical term for fainting or passing out, is defined as a transient loss of consciousness and postural tone. It is characterized by rapid onset, short duration, and spontaneous recovery, and is due to low blood flow to the brain that most often results from hypotension (low blood pressure). Many forms of syncope are preceded by symptoms including dizziness and loss of vision (“blackout”), loss of hearing, nausea and abdominal discomfort, weakness, sweating, and palpitations. Presyncope is when you feel these symptoms and the sensation of ‘almost passing out’ but do not lose consciousness. Syncope is extraordinarily common, occurring in people of all ages, particularly teenagers and the elderly.