There is no such thing as an optimal solution; 2-3 cm lung nodules are treated by biopsy or enhanced CT according to their benign or malignant nature. Benign lesions can be left untreated for a while with regular checkups or can be removed completely by surgery, while malignant lesions can be treated by surgical removal with radiotherapy and chemotherapy. 1. Benign nodules: Depending on the nature of the nodule and whether there are obvious symptoms, treatment can be chosen. If nodules remain in the lungs after tuberculosis is cured, fibrosis of the lungs may also appear as fibrous foci of pulmonary nodules, which generally do not need to be surgically resected, and can be reviewed regularly. If the infected nodular foci are caused by infection, they should be treated with antibiotic drugs such as penicillin, and the nodules usually shrink or disappear after cure. If it is a benign tumor in the lung, depending on the size of the tumor, ≤3cm can be considered for regular review. 2. Malignant nodule: If it is a malignant tumor of lung, it should be surgically resected as early as possible, together with radiotherapy and chemotherapy to prevent metastasis and recurrence. It is recommended that patients should go to the hospital for treatment under the doctor’s guidance after clarifying the nature of the nodule through enhanced CT or biopsy.