Lu-RADS category 3 solid nodules in the lungs are uncharacterized nodules, mostly due to benign disease, and are usually not serious, but still have the potential for malignancy and need to be reviewed regularly. The Lu-RADS classification is an assessment of the benign or malignant nature of a lung nodule based on lung imaging.Category 3 refers to uncharacterized nodules, or nodules with a high likelihood of being benign, with a malignant risk of 1% to 2%. Solid nodules are lung nodules with a solid density component, and approximately 7% of solid nodules are malignant. Lu-RADS3 solid lung nodules are mostly caused by benign diseases such as malignant tumors and granulomas, which are not serious and can be improved or cured with timely treatment; however, there is still a possibility of malignant changes, which requires regular review. If the nodules are assessed to have a malignant tendency in the follow-up review, timely surgical resection is recommended in order to avoid jeopardizing the health of the patient. Patients are advised to consult their specialists and follow the doctor’s instructions for follow-up examinations or treatment.