The few nodular shadows in both lungs are mostly considered to be caused by bad living habits, benign lung diseases, malignant tumors and other reasons. Small nodular shadows in both lungs refers to the high-density light spots visible in the lungs in x-ray or ct examination, which are generally opaque and round nodules with clear boundaries, and can be single or multiple, and can be categorized into solid, sub-solid, and ground-glass according to their densities. The reason for their appearance may be caused by long-term smoking, exposure to dusty environments and other bad habits. There may also be disease causes, such as chronic inflammation, bronchial lesions, tuberculosis and other benign lesions, or malignant tumors. If it is a solitary isolated nodule, the possibility of primary lung cancer is high, and multiple lung nodules may be metastatic tumors. The shadow of small nodules in both lungs can also be seen in other diseases, and it is recommended that patients go to regular hospitals in time to consult the professional doctor’s opinion.