Early impaired lung function is not yet symptomatic people, can be recovered through appropriate exercise, walking, jogging, swimming, playing Tai Chi are more appropriate. At the same time, pay attention to nutrition to keep up, some patients with impaired lung function are in a high metabolic state, energy consumption is several times higher than normal people. Therefore, this group of people, especially patients with chronic diseases such as chronic obstructive pulmonary disease, to eat less and more meals, can be appropriate to more intake of high-protein foods, vegetables. In order to detect the disease early, five types of people must have a lung function test: 1, long-term smokers If you are a smoker with a long time or smoke a lot of cigarettes every day, no matter how old you are, you should go to the hospital to test whether the lung function is normal. Smoking can lead to emphysema and bronchitis, and lung function will decline as a result. In the early lung function decline is not easy to detect the human body, often in the decline in the serious after the more obvious symptoms such as dyspnea will feel. 2.Chronic cough and sputum Repeated coughing and sputum, indicating the presence of airway or lung disease, these diseases may cause decreased lung function. 3.People with dyspnea If chest tightness and shortness of breath occur after activity, especially those who are gradually aggravated, it is important to think about whether there is a problem with lung function, and need to do a pulmonary function test. People who are older often do not pay enough attention to this, thinking that shortness of breath after walking or climbing stairs is due to old age. 4, people working in special environments If the work environment, to contact with polluted gases, dust, etc., can lead to occupational lung disease, lung function decreased. 5, patients with respiratory diseases People suffering from bronchitis and chronic emphysema need regular lung function tests. This will not only be able to find some basic symptoms, but also timely treatment at the initial stage. There are also a number of other diseases related to the lungs also need to do regular checks, lung disease can not be delayed, early detection and early treatment. Lung function tests should be performed for all diseases that may have an impact on lung ventilation. It is also of great value in the diagnosis and differential diagnosis of common respiratory diseases such as asthma, chronic obstructive pulmonary disease (emphysema), inhalation of foreign bodies in the airways, bronchitis, pneumonia, pleurisy and so on.