Numbness of the whole body and stiffness of the arms and legs when crying is due to hyperventilation syndrome, which is a common functional disorder. This is a common functional disorder. When a patient cries, because of poor ventilation and lack of oxygen, he or she will unconsciously inhale and exhale loudly, resulting in excessive discharge of carbon dioxide from the body, causing a relative decrease in carbon dioxide concentration in the blood and nervous system. When the concentration and partial pressure of carbon dioxide decrease to a certain level, it will affect the receptors and cause numbness in the limbs, sometimes with obvious numbness around the mouth, and in severe cases, the patient will have stiffness in the hands and feet, or even convulsions. This disease does not cause serious consequences, if it occurs, you can use a disposable paper cup or paper bag to cover the patient’s mouth and nose, so that the exhaled carbon dioxide will be sucked back into the body, after ten minutes most of the symptoms can slowly alleviate.