A small lung nodule is a lung nodule that is <1cm, and a 2mm small nodule in the right lung is a lung nodule that is located in the right lung, is 2mm in size, and is usually caused by a benign nodule. Normal people have left and right lungs called left and right lungs, the left lung is narrower and longer due to the presence of the heart and the right lung is wider and shorter. Lung nodules are defined as lung masses ≤3 cm detected by imaging such as chest CT, and small lung nodules are defined as nodules <1 cm in size.Lung nodules are imaging manifestations of a wide range of benign and malignant diseases of the lungs, such as pneumonia, tuberculosis, misshapen tumors, and sarcoidosis, among other benign diseases, as well as bronchopulmonary carcinoma, among other malignant diseases. The risk of malignancy of lung nodules is related to the size of the lung nodule, and the malignancy rate of small 2-mm lung nodules is usually almost 0, mostly due to benign lung diseases. The risk of malignancy of lung nodules is also related to the shape, density and calcification of the nodules, etc. It is recommended that the patient consults with a specialist in a timely manner, analyzes the possible causes of the disease in conjunction with other test results, and follows the doctor's instructions for further examination or treatment.