Hyperventilation, also known clinically as hyperventilation syndrome, is a series of symptoms caused by the body exceeding its normal respiratory function through excessive inhalation and exhalation. It is more prone to respiratory alkalosis, commonly seen in hysteria, where hyperventilation and expiration occur as a result of anxiety, irritability, stress or mental stimulation from a major event, causing adverse physiological and psychological reactions. Carbon dioxide is constantly being excreted from the body in excess, and the concentration of carbon dioxide in the body is too low. At this time, numbness, convulsions, spasms of the skin of the hands, feet and limbs, and even symptoms of drowsiness and coma can occur.