Generally 5mm solid nodule in the upper lobe of the right lung is not serious, but the possibility of malignant tumor in the lung cannot be ruled out, it is recommended to combine with medical history and further examination. Solid nodules in the lungs can be judged according to their size, shape and margins. Generally speaking, solid nodules with a diameter of less than 8mm, regular shape and clear margins are likely to be benign, which may be caused by inflammation, calcification or inflammatory pseudotumor, and are generally not serious. Symptomatic treatment and regular follow-up are sufficient. If the nodule continues to increase in size during the follow-up process, and there are changes in characteristics such as lobulation, burr, and pleural pulling, then malignancy is considered, and further relevant examinations such as enhanced CT of the chest are needed, and pathologic puncture biopsy or surgical resection is necessary to clarify the nature of the nodule and determine the follow-up treatment. If a 5mm solid nodule is found in the upper lobe of the right lung, it is recommended to consult a doctor and follow the medical advice.