Scattered microscopic nodules in both lungs are usually not serious if they are benign, and they are usually serious if they are malignant or produce severe damage to the lung tissue. Generally scattered nodules in both lungs are most commonly caused by inflammatory reactions in the lungs themselves, such as inflammation of the lungs due to bacterial infections such as Staphylococcus aureus, Mycobacterium tuberculosis, Streptococcus pneumoniae, etc., which leads to varying degrees of fibrosis in the lungs. It can usually be cured by timely anti-inflammatory and anti-tuberculosis treatment and is usually not serious. If the scattered nodules in both lungs belong to malignant lesions, such as bronchoalveolar carcinoma or distant metastasis of other cancers, they are generally more serious and need to be treated with surgery, radiotherapy, chemotherapy, targeted therapy, immunotherapy, etc. according to the condition. If there are scattered nodules in both lungs, one should consult a doctor in time, and be treated positively after the cause of the disease is clarified.