Common causes of vague pain under the right rib cage include pleurisy, an inflammation of the right pleura that can cause vague pain under the right rib cage, which can increase with breathing or coughing. There is also chondromalacia, intercostal neuralgia, and lesions of the ribs themselves, which can also cause vague pain under the right rib cage, such as fractures and contusions of the ribs and rib cartilage, as well as local muscle damage, often due to long hours of ambulatory work, or incorrect sitting posture, as well as twisting the waist and improper sleeping posture, which can also lead to local muscle damage and vague pain under the right rib cage. Local inflammation of the right side of the lung or liver lesions can also cause vague pain under the right rib cage, such as liver abscess, hepatitis, liver cancer, and other organ lesions can also cause vague pain under the right rib cage. If the vague pain below the right rib cage is more persistent, you should go to the hospital and under the guidance of a doctor, have relevant tests done to further clarify the cause.