It is normal to have sharp rib-diaphragm angles on both sides. This is usually the result of a chest X-ray. If the angle of the rib diaphragm is blunted, meaning that there is pleural fluid in the space between the chest wall and the diaphragm, this indicates that there are lesions in the lungs and chest wall, such as infection, inflammation and tuberculosis of the lungs, tumors, and bleeding due to trauma, etc., which may lead to a blunted angle of the rib diaphragm, and therefore it is good to have sharp angles of the rib diaphragm. However, a sharp rib-diaphragm angle does not mean that there are no problems in the lungs and chest wall, and it is best to conduct CT scanning of the lungs and chest or further blood tests to determine whether there are lesions in the lungs and chest cavity.