The bad thing about oxygen in the elderly is that it may lead to oxygen toxicity and lung damage. The bad side of oxygen intake in the elderly is that it may lead to oxygen toxicity and lung injury in general. Elderly patients using oxygen machine to inhale oxygen, if the oxygen concentration is too high, it may lead to oxygen toxicity or lung injury caused by excessive pressure. Elderly patients with chronic obstructive pulmonary disease (COPD) should use low-flow oxygen and should not receive oxygen for too long. Prolonged high-flow oxygen intake may cause oxygen toxicity, retinal damage, nasal mucous membrane damage, nosebleed, respiratory distress syndrome, pulmonary atelectasis and so on. If the elderly with acute lung injury use oxygen machine to inhale oxygen, you can use a high concentration of oxygen, which will help the condition to recover The elderly should pay attention to the safety of oxygen intake, especially when using oxygen cylinders for oxygen intake, pay attention to avoid putting open fire next to it, and pay attention to whether there is any localized air leakage when using it. When stopping oxygen intake, the oxygen valve should be closed in time.