There are many reasons for right subcostal pain, most commonly due to costochondritis, but also due to soft tissue injury caused by trauma, costal neuritis, liver, gallbladder and other diseases. Costal chondritis refers to the inflammatory reaction of the cartilage at the junction of the sternum and the ribs, which can cause localized pressure and pain under the ribs; the main organs under the right side of the ribs are the liver and the gallbladder, so hepatitis, cholecystitis, liver tumors, and other diseases can also cause pain in the area; inflammatory oozing of tuberculosis of the right lungs produces a pleural reaction that can cause pain in the corresponding area. The causes of right subcostal pain are varied, and the specific etiology needs to be synthesized with the patient’s medical history, the nature of the pain, the duration of the pain, and the combination of auxiliary examinations in order to make a definitive diagnosis and treatment.