A small nodule in the lower lobe of the right lung is a lung nodule located in the lower lobe of the right lung, <1cm in size, which may be caused by benign or malignant lung diseases. Normal people have left and right lungs, of which the left lung is narrower and longer due to its proximity to the heart and is divided into upper and lower lobes, while the right lung is wider and shorter and can be divided into upper, middle and lower lobes. Different lung diseases may have different favorable sites, for example, small nodules in the upper lobe of the lung are more likely to be malignant than those in the middle and lower lobes, and tuberculosis is more likely to occur in the lower part of the upper lung and the upper part of the lower lung. Lung nodules are lung masses ≤3 cm found on imaging such as chest CT, while small lung nodules are those <1 cm in size.Lung nodules are the imaging manifestation of a variety of benign and malignant diseases of the lungs, and they may be benign diseases such as pneumonia, tuberculosis, sarcoidosis, misshapen tumors, and rheumatoid nodules, as well as malignant nodules such as bronchopulmonary carcinomas. Small nodules in the lower lobe of the right lung can also be analyzed according to the specific size, shape, density, border, calcification and other conditions of the nodule to comprehensively analyze the possible causes of the disease. Patients are advised to consult a specialist and follow medical advice for further examination or treatment.