Disseminated nodular foci in both lungs refers to multiple nodular foci scattered in both lungs, usually less than 3cm in diameter, which can be caused by lung infection, tuberculosis, pneumoconiosis, autoimmune disease, etc. 1.Lung infection is a common cause of abnormal nodular foci. 1. Lung infection: Lung infection is a common cause of abnormal nodular foci in the lungs, which may be caused by bacterial, viral or fungal infections, and the nodular foci may become smaller or disappear after active anti-infective treatment. 2. Tuberculosis: Tuberculosis can cause scattered or diffuse nodular lesions in both lungs, and patients may have low-grade fever, fatigue, night sweats and other discomforts. After standardized anti-tuberculosis treatment, nodular foci may shrink or disappear. 3. Pneumoconiosis: If small particles such as coal dust and silica dust exist in the normal living environment or working environment for a long time, the particles will accumulate in the lungs after entering the respiratory tract and lead to the appearance of scattered nodular foci in both lungs. 4. Autoimmune diseases: rheumatoid arthritis, more often caused by interstitial lung disease, can also cause single or multiple nodules in the lungs. Scattered nodular foci in both lungs can also be caused by other reasons. If you find scattered nodules in the lungs, you should consult a doctor in a timely manner, complete the examination, clarify the cause of the disease, and choose the appropriate treatment plan under the guidance of the doctor.