Most patients with pulmonary nodules do not experience back pain, in fact, many patients with pulmonary nodules have no obvious symptoms, often found during physical examination, and a few may experience occasional back pain. Lung nodules are focal hyperdense shadows in the lungs with a diameter of <3 cm, which can be solid or sub-solid, and sub-solid is divided into mixed density shadows, ground glass density shadows, etc. Many lung diseases can form lung nodules. Lung nodules can be formed in many lung diseases, including benign nodules and malignant nodules. 1. Benign lung nodules include inflammatory nodules, tuberculosis nodules, pulmonary nodular disease, pulmonary fungal infections, etc. Most of the patients show non-specific respiratory symptoms, such as coughing, coughing up sputum, wheezing, dyspnea, etc. Infectious causes can also cause fever, chills and other symptoms, and back pain is not common. 2. Malignant lung nodules include primary lung cancer and lung metastases. (1) Lung cancer manifested as lung nodules is mostly in the early stage of carcinoma in situ or cancer, at this time, patients mostly have no obvious specific performance. When the tumor keeps increasing and invades the back pleura or even spinal metastasis, back pain may appear, but most of the patients are already in the advanced stage of cancer. (2) Metastatic malignant lung nodules are the result of lung metastasis of malignant tumors in other parts of the body. At the initial stage, there is no obvious manifestation, and the nodules are often found in the review of the lungs, but the primary lesion can be metastasized to the spine at the same time, which may lead to the symptoms of back pain. Patients who find lung nodules are recommended to go to the hospital as soon as possible, to clarify the nature of nodules as soon as possible, and to be treated under the guidance of professional doctors.