<unk>  is fainting or dizziness as a result of overheating (syncope is the medical term for fainting). It is a type of<unk>  illness. The basic symptom of<unk>  is fainting, with or without mental confusion.<unk>  is caused by peripheral vessel dilation, resulting in diminished blood flow to the brain and dehydration.
Heat syncope
Reflex syncope
Laughter-induced syncope
Postural orthostatic tachycardia syndrome
Panic attack
Permissive hypotension
Heat stroke
Reflex asystolic syncope