There are numerous causes of multiple small nodules in both lungs, which should be determined by combining multiple factors such as the size, location and morphology of the lung nodules. The causes may be occupational diseases such as pneumoconiosis, simple inflammatory nodules, infections such as tuberculosis and fungal infections of the lungs, and malignant lesions such as primary lung cancer and lung metastases. 1. Occupational diseases: such as pneumoconiosis, silicosis and so on. Mostly seen in mining workers, coal workers and other special working people, caused by long-term exposure to harmful dust. 2. Simple inflammatory nodules: local nodular changes caused by long-term stimulation of chronic inflammation and local tissue hyperplasia, often with a diameter of <1cm, regular morphology, no clear foci of infection, and no obvious changes on regular follow-up. 3. Infectious lesions: such as pulmonary candida, pulmonary cryptococcosis and other fungal infections, or acute corn-like tuberculosis, the lung can appear multiple nodules. The aetiology should be identified in time, and anti-infective treatment should be targeted. 4. Malignant lesions: If precancerous lesions, primary lung cancer or lung metastases are suspected, it is necessary to clarify the pathology and staging as soon as possible, and choose reasonable treatment options such as surgery, chemotherapy, radiotherapy or targeted therapy under the guidance of doctors. Multiple small nodules in both lungs may also have other causes, which need to go to regular hospitals in time, close follow-up and regular review. If necessary, the cause of the disease should be clarified. If treatment is needed, standardized treatment under the guidance of the doctor, so as not to bring adverse effects to the body due to delayed condition.