Scattered micronodular shadows in both lungs generally refer to the presence of round, round or irregularly shaped micronodular lesions in the lungs detected by chest imaging, which need to be considered for long-term exposure to dust, infectious lesions, tumors and other reasons. Scattered micronodular shadows in both lungs may be caused by chronic inflammation due to prolonged exposure to dust, smoking, polluted air, etc.; they may also be caused by infectious lesions in the lungs, such as fungal infections, Mycobacterium tuberculosis, etc.; or they may be the old lesions caused by tuberculosis after it has been cured. In addition, scattered micronodular shadows in both lungs do not exclude the possibility of malignant tumors such as lung cancer or metastatic carcinoma, in which the size of nodular lesions will gradually increase with the development of the disease. Scattered micronodular shadows in both lungs can also be caused by other diseases. It is recommended that the patient should consult the doctor in time, complete the examination to clarify the nature of the nodules, and choose the appropriate treatment plan under the doctor’s guidance.