Hypoxia needs to be relieved by oxygen inhalation, and at the same time, the etiology of hypoxia should be treated, and the common etiologies are respiratory system diseases, cardiovascular system diseases, and hematological system diseases. 1. Respiratory system: tracheal stenosis or foreign body, need to perform tracheotomy, the first time to establish respiratory access to oxygen, and remove the foreign body or release the stenosis; pleural effusion or pneumothorax, resulting in compression of the lung tissue, the need for closed thoracic drainage, discharge of fluid or gas; lung infection requires anti-infection treatment; bronchial asthma needs to be corrected with medication to correct the spasm of the bronchial tubes. 2. Cardiovascular system: acute left heart failure requires oxygen intake and active anti-heart failure treatment to correct pulmonary circulation stasis. 3. Hematological system: various types of anemia, hemoglobin in the blood is an important substance for transporting oxygen, when hemoglobin is low, the ability to transport oxygen decreases, and symptoms of hypoxia appear, requiring oxygen while treating and correcting anemia. If the symptoms of hypoxia appear and there is no treatment condition, under the condition of ensuring the safety of the environment, ensuring calm rest, avoiding agitation, increasing oxygen consumption, calling 120 or seeking help from others, seeking medical treatment in a timely manner and standardizing the treatment.