The benefits of oxygen intake for lung cancer patients include relieving hypoxia and improving symptoms. 1. Relieve hypoxia: Early stage of lung cancer, the symptoms are not very obvious, and some patients have no performance. With the development of the disease, patients may suffer from hypoxia, because the cancer cells affect the lung function, which causes the decrease of oxygen exchange function of the lungs, and hypoxemia occurs, which can be relieved by oxygen inhalation. 2. Improvement of symptoms: lung cancer patients in middle and late stages usually show chest pain, chest tightness, dyspnea, sedentary respiration and inability to lie down, in which case oxygen can be inhaled to relieve these symptoms. The treatment of lung cancer should be carried out under the guidance of physician’s interview, do not use medicine by yourself to avoid further development of the disease.