CT nodules in the lungs generally indicate chronic infectious diseases in the lungs, including ground glass nodules, partially solid nodules and solid nodules, and mostly require high-resolution CT of the chest to more accurately describe the size of the nodules, thus facilitating the identification of the nature of the nodules. CT nodules in the lungs should ask patients whether they have a history of long-term smoking, a history of dust work, including masonry, coal mining, etc., and previous self Immune diseases, such as Wegener’s granulomatosis, systemic lupus erythematosus, rheumatoid arthritis, etc. causing lung damage. Some patients have had tuberculosis and after aggressive anti-tuberculosis treatment, small fibrous nodules are left on the lungs. Such nodules may proliferate and calcify, and as long as they are dynamically observed with regular treatment, they are not considered to recur. In any case, if there are small nodules in the lungs on CT, high-resolution CT of the chest must be performed, and if necessary, percutaneous lung puncture can be performed to obtain cytological examination to clarify whether the nodules are inflammatory, tuberculosis or tumor changes.