The vague swelling below the right rib cage, which occurs, should be considered for the following reasons: First, intercostal muscle strain: due to the patient’s prolonged ambulatory work and improper sitting posture, such as often twisted work, can cause an imbalance in the force on the bilateral intercostal muscle, often triggering intercostal muscle strain on one side, which can manifest as soreness and pain in the rib area on one side, often aggravated by exertion. Second, costochondritis: mainly due to excessive mental stress or viral infection, causing aseptic inflammation of a single rib cartilage, which manifests as soreness and pain in the rib cartilage area.