There is no such thing as three kinds of lung diseases that don’t need treatment. Clinically, there are many common lung diseases that don’t need medication or other means of intervention, and they can be dynamically observed and regularly reviewed, such as old tuberculosis and mild chronic obstructive pulmonary disease in remission. 1. Old tuberculosis: old tuberculosis refers to the residual fibrous scar foci and calcified foci of patients who have been infected with tuberculosis in the past and have been treated with anti-tuberculosis drugs. Such patients do not contain tuberculosis bacilli in lung tissue, no tuberculosis bacilli lesions, no tuberculosis bacilli coughed out in sputum, and are not infectious. Old tuberculosis is stable and static foci, and usually does not need treatment. Patients maintain good living habits and strengthen their resistance and immunity. 2. Mild COPD in remission: during this period, the patient’s lung function is not significantly affected, and there is no need to use drugs for the time being. During the remission period, patients should pay attention to strengthening nutrition, improving immunity, preventing respiratory infections and avoiding aggravation of COPD. There are also asymptomatic lung diseases such as pulmonary maculopapular disease that do not require treatment for the time being. The specific situation needs to be carried out under the guidance of the doctor after consultation.