Multiple nodules in both lungs are interpreted on imaging and arise from numerous causes, mainly respiratory diseases, rheumatic diseases and tumors. 1. Respiratory diseases: the most common cause of multiple nodules in both lungs is respiratory diseases, such as tuberculosis, pneumonia, silicosis, silicone lung and lung adenocarcinoma and other respiratory diseases. 2. Rheumatic diseases: If you suffer from rheumatic diseases, you may also have multiple nodules in both lungs, such as granulomatous vasculitis nodules and other diseases. 3. Tumors: If the tumors of other tissues and organs metastasize to the lungs, it will also produce the manifestation of multiple nodules in both lungs, such as breast tumors and gastrointestinal tumors metastasized to the lungs and so on. Patients with multiple nodules in both lungs need to go to the hospital for further examination in time, and carry out standardized treatment under the guidance of professional doctors in combination with clinical manifestations.