A non-calcified nodule in the lung is firstly a nodule found in the lung on imaging and secondly a nodular lesion characterized by the absence of calcification. Non-calcified nodules in the lungs are commonly seen in diseases such as lung infections, tuberculosis and lung malignancies. Lung nodules are increased density shadows with a diameter of 3cm or less. Non-calcified refers to relatively low density ground glass nodules and relatively high density solid nodules, and calcified nodules have a density close to that of bone. 1. Lung infection: such as pneumonia, with acute symptoms of infection, such as fever, cough, sputum, etc., imaging examination can see a single round solid or ground glass-like changes. 2. Tuberculosis: Primary foci can be seen in the lungs, mostly manifested as cloudy flocculent or rounded hyperdense shadows with blurred edges. Accompanying symptoms include low-grade fever and night sweats. 3. Malignant tumor: CT review, such as nodule enlargement with diameter larger than 8mm, ground glass shadow or with solid shadow, nodule appearing burr, lobulation, vacuole sign, vascular sign, etc., do not exclude malignant tumor, such as lung cancer. If there are non-calcified nodules in the lungs, it is recommended that patients go to the hospital as soon as possible to avoid delaying their condition.