Hyperventilation, which is also commonly known as hyperventilation syndrome in clinical practice, is mainly characterized by obvious dyspnea accompanied by numbness or convulsions of the limbs. The first aid method is to find out the causative factors, with psychotherapy as the main treatment, supplemented by tranquilizers, anti-anxiety drugs as a supplement, but also can be carried out respiratory training and so on. 1.Symptoms: (1) Mental state, the patient may appear nervousness, anxiety, agitation or even fainting. (2) Head and face symptoms, such as dizziness, numbness of the mouth and lips, and pallor. (3) Cardio-thoracic symptoms, such as chest tightness, chest pain, palpitations, etc. (4) Respiratory symptoms, such as dyspnea, shallow and rapid breathing, easy wheezing and shortness of breath. (5) Digestive symptoms, such as bloated stomach and indigestion. (6) Limb symptoms, such as numbness of the limbs, cold hands and feet. 2. First aid methods: (1) Psychological treatment: the doctor will provide psychological comfort to the patient to eliminate the fear. (2) Suggestion therapy: let the patient believe that the therapeutic drug is a special drug, the efficacy is quite good, most of the patients can terminate the seizure after being implied. (3) Physical therapy: such as putting a mask over the mouth and nose to slow down breathing. (4) Drugs: If necessary, sedatives, such as diazepam, can be used to play a sedative and anti-anxiety effect. Once hyperventilation syndrome occurs, it is necessary to go to the hospital in time, and under the guidance of the doctor for reasonable treatment.