Multiple solid nodules in both lungs are the presence of 2 or more nodules in the lungs, which may be caused by inflammation of the lungs, tuberculosis, or lung tumors. 1. Lung inflammation: If there are bacterial, viral or fungal infections in the lungs, and the inflammation does not go away for a long time, it may lead to the appearance of multiple solid nodules in the lungs. Generally, active treatment of the primary disease can effectively improve the situation. 2. Tuberculosis: Multiple solid nodules in the lungs may also be the result of old scars formed after the healing of tuberculosis. 3. Lung tumors: Multiple solid nodules in the lungs may be related to lung tumors, after excluding other diseases, we need to improve the pathology examination in time to clarify the benign or malignant nature of the tumor. There are many reasons leading to multiple solid nodules in the lungs, it is recommended to actively cooperate with the doctor to improve the relevant examinations, make a clear diagnosis and take targeted measures.