Double lung nodules are not necessarily lung cancer. Some benign lung lesions such as pneumonia and tuberculosis can also present as double lung nodules. Lung nodules are lesions less than 3 cm in diameter, and lesions larger than 3 cm are called masses. The presence of double lung nodules requires a comprehensive judgment based on the nodule’s nature, size, location, family history, and other factors. Most pulmonary nodules are benign lesions, i.e., inflammatory pseudotumors, commonly associated with pulmonary tuberculosis. Only a small percentage of lung nodules are manifestations of lung cancer, which can be seen as single lung nodules in the early stage of lung cancer and occasionally as multiple cases. When the nodules in both lungs are small, patients often do not feel any discomfort and do not need special treatment, and regular review is sufficient. If the nodules in both lungs suddenly increase in size, and patients experience coughing and breathing difficulties, or even blood in sputum, they should go to the respiratory medicine department in time for further examination to clarify the cause and timely treatment. Since double lung nodules are closely related to lung cancer, patients should pay enough attention to double lung nodules once they are found and have regular follow-up examinations to understand the changes of nodules.