The possible causes of tiny nodules in the lungs include simple inflammatory nodules, tuberculosis, lung tumors and so on. 1. Simple inflammatory nodules: due to long-term stimulation of lung tissue by dust, air pollution, etc., multiple inflammatory tiny nodules can be formed in the lungs. 2. Tuberculosis: Tuberculosis, especially acute granulomatous tuberculosis, there will be diffuse tiny nodules in both lungs, and the patients will have tuberculosis toxicity symptoms, such as low-grade fever, night sweating, dry cough, emaciation and other discomforts. 2. Lung tumors: benign lung tumors, such as lung malignant tumor, fibroma, papilloma, etc., will also form tiny lung nodules, which are generally smooth and slow-growing; malignant lung tumors, such as squamous cell carcinoma, adenocarcinoma, small cell carcinoma, etc., will also form tiny lung nodules, which are fast-growing and may have burrs. Lung micronodules can also be caused by other reasons. It is suggested that patients should consult the doctor in time to clarify the cause of the disease and get early treatment so as not to delay the disease.