<unk>  is also known known as vasovagal syncope, reflex syncope, and neurally mediated syncope,.It refers to a fainting spell that usually occurs in response to a specific trigger.<unk>  is common, making up 80% of all types of all syncopal episodes. In<unk> , fainting generally occurs due to a momentary loss of blood flow to the brain which deprives the brain of oxygen. The fainting spell is involuntary, and there is usually rapid recovery afterwards. Episodes of dizziness or lightheadedness without losing consciousness is called pre-syncope. Injuries can occur as a risk of syncope or fainting, and syncope can also signal an impending cardiac arrest. It is important to distinguish<unk>  from other causes of fainting or loss of consciousness, such as low blood sugar levels in diabetics, seizure, or heart attack.<unk>  is essentially a momentary failure of the brain and the cardiovascular system to communicate with each other, causing a fainting spell in response to a particular trigger.<unk>  is usually benign, however one should see a doctor following a fainting spell especially if it is the first one.
Neurocardiogenic syncope
Heat syncope
Vasovagal syncope
Defecation syncope
Micturation syncope
Postural orthostatic tachycardia syndrome
Panic attack
Hypertensive crisis