Multiple infiltrating shadows in both lungs may be lobar pneumonia, tuberculosis, thymoma and other diseases. 1. Lobar pneumonia: a disease caused by bacteria such as Streptococcus pneumoniae, mostly caused by bacterial infection, lowered immunity, etc. Chest imaging can show patchy infiltration and other manifestations, and the symptoms can be seen as high fever, coughing, coughing rust-colored sputum, dyspnea, and hemorrhagic dots on the skin and mucous membranes. 2. Tuberculosis: It is a kind of respiratory infectious disease caused by Mycobacterium tuberculosis infection, mostly caused by low immune system and Mycobacterium tuberculosis infection. Infected patients, chest imaging may show lobular infiltration, etc. Symptoms may include cough, low-grade fever with blood in sputum, and emaciation. 3. Thymoma: it is the most common tumor in the anterior mediastinum, the etiology of which is still unknown. Part of thymoma can be seen as infiltrative growth with irregular edges on chest imaging, and the symptoms can be seen as chest pain, chest tightness, and superior vena cava obstruction syndrome, etc. Multiple infiltrating shadows are found in both lungs. Multiple infiltrating shadows in both lungs can also be seen for other reasons, and one should go to the hospital in time to clarify the cause of the tumor and actively cooperate with the doctor’s treatment.