If patients with rectal cancer have nodules in lungs, it is often considered to be caused by lung metastasis of rectal cancer, which needs to be treated with medication, surgery, radiotherapy, chemotherapy and other therapeutic measures according to the cause of the disease. Rectal cancer is a malignant tumor occurring in the mucosal epithelium of rectum, which belongs to the common digestive tract tumors, and lung metastasis can occur in the late stage, which can be manifested as lung nodules. For patients with no contraindication to surgery, lung nodule resection is generally recommended, and at the same time, it can be combined with radiotherapy, chemotherapy and other comprehensive treatments, so as to control the metastasis of cancer cells and achieve the effect of improving prognosis. Once patients with rectal cancer have nodules in lungs, they should report to doctors in time and cooperate with doctors to take relevant treatment measures.