Lung nodules 0.5 cm treatment and nodule causes are closely related, if it is benign lesions caused by lung nodules, you can use conservative treatment or surgical treatment to do the treatment, such as pneumonia, tuberculosis, trauma, benign tumors, etc.; if it is a malignant lesion caused by lung nodules, the need for surgical treatment and may also need to be combined with radiotherapy, such as lung cancer. 1. Benign lesions: if it is caused by pneumonia, tuberculosis and other infectious lesions, it should be actively treated with anti-infective therapy, such as isoniazid, rifampicin, etc.; if it is caused by benign tumors, it can be observed at first, but it should be reviewed regularly, if it is found that the nodule grows faster during the review period, it is necessary to remove the nodule in time, to prevent malignant transformation of the nodule. 2. Malignant lesions: For 0.5cm nodules caused by lung cancer and other malignant diseases, it is necessary to cooperate with doctors as soon as possible to use surgical resection to deal with them, and after the operation, it is usually necessary to do further radiotherapy treatment, so as to better eliminate malignant cells and reduce the risk of recurrence. It is recommended that the patient first consult a doctor for further examination to clarify the nature of the nodule, and then under the guidance of the doctor for treatment.