Oxygen inhalation, generally normal inhalation of oxygen standardized inhalation is not complications, mainly appear in the absence of standardized oxygen inhalation, such as oxygen partial pressure is too high, may cause the system tissue organs to take in more oxygen, pathological changes. Excess oxygen can produce oxygen free radicals, which can damage cells and lead to various degrees of multi-organ function insufficiency or even failure, such as liver and kidney failure, as well as there may also be symptoms of the lungs, such as pain, cough, palpitations. In addition, if the pressure of oxygen inhalation is too high, it may instantly break through the alveoli, causing the lungs to rupture and bleed, resulting in severe lung failure.