Lung involvement is seen in 85% of patients with mixed connective tissue disease. Only 27% of them present with clinical symptoms, mainly shortness of breath, chest pain and dry cough. Interstitial fibrosis, pleural effusion, pleural hypertrophy or pulmonary hypertension occur in a minority of patients. Prevention of lung involvement should pay attention to the following: Increase the intake of antioxidants Antioxidants that break the oxidation reaction and nutrient-rich foods such as thioglucoside with anti-cancer properties are effective for lung function and health. According to research, cruciferous vegetables (broccoli, rape, bok choy, chard, etc.) rich in such ingredients reduce the risk of lung cancer by more than 50% for those who eat them more than five times a week than for those who eat fewer such vegetables. Monitoring of atmospheric conditions Nowadays, pollution in cities is very serious, so people are very concerned about air pollution in a city. If there is a serious level of pollution or a warning of floating dust or sandstorm, you must take measures such as reducing exercise and wearing a mask during outdoor activities. The use of environmentally friendly products paint, fiber glass, detergents, insulators and other items used in the home, harmful gases or toxic substances into the words, there will be a certain threat to lung health. Therefore, the things used at home should be improved by environmentally friendly items. Water-based paints or cleaners where chemicals cannot enter, etc., and items that use volatile organic compounds should also be limited. It is common knowledge that smoking has the worst effect on the lungs. The risk of COPD emphysema, chronic bronchitis and lung cancer increases dramatically when you smoke. Studies have found that the smoke exhaled by smoking is indirect for smokers and others, and is one of the main causes of lung cancer. 85% of people who develop lung cancer are associated with smoking, and the risk of lung disease is related to the duration and amount of amateur smoking.