Fainting, also medically known as syncope, is a sudden onset state of loss of consciousness and muscle power resulting in the body going limp. Usually, a fainting spell is preceded by signs and symptoms that can alert the patient to the impending event. This is known as presyncope. The causes of fainting can range from non-serious to potentially fatal. Fainting occurs when the brain temporarily does not receive enough blood supply, which can be a one-off occurrence with no medical significance (as with a low blood pressure due to dehydration) or due to a serious problem of the circulatory or nervous system. Therefore, all fainting cases should be treated as an emergency and first aid should be given.