Multiple nodules in both lungs of 6 millimeters, not more than 1 centimeter, may be caused by tuberculosis, fungal infection, air pollution, metastatic tumors, etc., need to clarify the cause of the disease, and for the cause of the treatment. 1. Tuberculosis: it is a common disease that can lead to multiple nodules in both lungs. Sputum culture and tuberculosis bacillus test should be carried out in time, and anti-tuberculosis drugs such as rifampicin and isoniazid should be used to treat the disease after the diagnosis is clear. 2. Fungal infections: fungal infections in the lungs can easily lead to the formation of multiple nodules in the lungs, and antifungal drugs such as itraconazole and fluconazole should be taken according to the doctor’s instructions. 3. Air pollution: long-term exposure to dust or living in polluted air, easy to form multiple nodules in the lungs, for such cases, generally do not need to use medication. The main focus is to get rid of the polluted environment and follow up the size of the nodules. 4. Metastatic tumor: Multiple small nodules in both lungs may be caused by tumor metastasis from other parts of the body to the lungs, so it is necessary to clarify the location of the primary tumor and carry out active treatment for the primary tumor. Besides, multiple 6mm nodules in both lungs can be caused by other diseases, so it is recommended to consult a doctor in time and choose the appropriate treatment with the professional doctor’s examination, diagnosis and treatment advice.