Back pain after pulmonary nodule surgery may be caused by back nerve injury, recurrence of pulmonary nodule, lung tumor and other conditions. 1. Back nerve injury: it may cause back pain, if the pain is not obvious, then no treatment is needed, and the patient should avoid holding a position for a long time, if severe pain occurs, go to the hospital in time. 2. Lung nodule recurrence: Back pain may be caused by lung nodule infection, which leads to inflammation invading the wall pleura. If patients with past history of tuberculosis have back pain, it may be caused by the recurrence of tuberculosis, which leads to the invasion of pleura by lung lesions. 3. Lung tumor: back pain may be caused by local invasion of tumor, which grows near the back. When the tumor gradually increases in size and compresses the wall pleura or invades the chest wall, the symptom of back pain will appear. Back pain after lung nodule surgery may also be caused by other reasons. It is recommended that patients go to the hospital in time to avoid delaying their condition.