<unk>  occurs in response to a trigger due to dysfunction of the heart rate and blood pressure regulating mechanism. When heart rate slows or blood pressure drops, the resulting lack of blood to the brain causes fainting. Vasovagal Typical triggers include: * Prolonged standing * Emotional stress * Pain * The sight of blood * Fear of needles * Time varying magnetic field (i.e. transcranial magnetic stimulation) Situational * After or during urination (micturition syncope) * Straining, such as to have a bowel movement * Coughing * Swallowing * Lifting a heavy weight Carotid sinus Pressing upon a certain spot in the neck. This may happen when wearing a tight collar, shaving, or turning the head.
Reflex syncope
Hypotonic-hyporesponsive episode
Heat syncope
Laughter-induced syncope
Reflex asystolic syncope
Panic attack
Hair-grooming syncope
Postural orthostatic tachycardia syndrome