The probability of a 1cm solid nodule in the lungs being benign is about 80%. Solid nodules in the lungs are common nodal changes in the lungs, and the probability of a 1cm solid nodule in the lungs being benign can be about 80%, but a small number of them are still malignant and require further examination with enhanced CT or puncture biopsy for a definitive diagnosis. If the nodule is calcified or the whole nodule is calcified, most of them are benign; if the nodule is a gross glass-like nodule, semi-solid, with burrs and vacuoles in the middle, the chance of malignancy is higher. In summary, patients are advised to undergo further examination by a doctor who will combine the medical history (e.g., history of occupational exposure, smoking, chronic lung disease, personal and family history of tumor, etc.), pathological biopsy, and relevant laboratory tests to make a definitive diagnosis and provide treatment as early as possible.