The lower margins of the lungs normally intersect the 6th rib in the midclavicular line. The lungs are located on both sides of the mediastinum in the thoracic cavity, and the projections of the lower border of the lungs are approximately the same, starting from the 6th thoracic rib articulation on the right side and from the midpoint of the 6th rib cartilage on the left side, and going outward and downward on both sides, and intersecting with the 6th rib in the midclavicular line. With respiratory movement, the position of the lower border of the lungs changes, and in normal respiration it is generally located at the intersection of the 6th rib space in the mid-clavicular line, intersects the 8th rib in the mid-axillary line, intersects the 10th rib in the scapular line, and terminates in the paraspinal plane of the 10th thoracic vertebra in the paraspinal region. When there are uncomfortable symptoms in the lungs, the position of the lower edge of the lungs may change with the change of breathing. For example, obstructive lung diseases and pulmonary atelectasis, abdominal effusion, abdominal distension, hepatosplenomegaly, and intra-abdominal tumors may lead to the elevation of the lower edge of the lungs, and emphysema, and the prolapse of organs in the lung cavities may lead to the lowering of the lower edge of the lungs. If you experience uncomfortable symptoms or notice any persistent unrelieved signs on your own, you should go to the hospital for examination and follow the doctor’s instructions for treatment. So as not to miss the condition.