Brief periods of unconsciousness usually cause no lasting harm to health.<unk>  can occur in otherwise healthy individuals, and has many possible causes, often trivial ones such as prolonged standing with the legs locked. The main danger of vasovagal syncope (or dizzy spells from vertigo) is the risk of injury by falling while unconscious. Medication therapy could possibly prevent future vasovagal responses; however, for some individuals medication is ineffective and they will continue to have fainting episodes.
Reflex syncope
Hypotonic-hyporesponsive episode
Heat syncope
Laughter-induced syncope
Reflex asystolic syncope
Panic attack
Hair-grooming syncope
Postural orthostatic tachycardia syndrome