Suddenly hands open like a chicken claw is most common in hyperventilation syndrome or hypocalcemia, people will unconsciously speed up breathing, frequent gasping, large amounts of ventilation after too much emotional excitement, anger, crying, resulting in a large amount of carbon dioxide in the body to exhale, so that the plasma carbon dioxide partial pressure decrease, PH value increases, will lead to respiratory alkalosis. Hyperventilation syndrome, often manifested as respiratory effort, chest tightness, a sense of pressure, a sense of suffocation, tachycardia, numbness of the ends of the limbs and face, twitching of the hands and feet in the form of a chicken-claw, and even dizziness, headache, impaired consciousness and so on. Once this situation occurs, you need to immediately give the patient to calm the patient’s psychology to make the patient calm, guide the patient to breathe slowly, recommended for assisted breathing, by slowing down the respiratory rate to reduce excessive carbon dioxide exhalation, can also be given to the mask to limit the ventilation, so that the patient to inhale their own carbon dioxide exhalation, in order to correct the hypo-carbonicemia, or you can choose a cardboard tube so that the patient to breathe in a cardboard tube, do not need a special treatment! The patient will relieve slowly.