Pain in the lower right chest when breathing is mainly considered to be caused by respiratory diseases, including pneumonia, tuberculosis, lung tumor, pleurisy, intercostal neuritis and other conditions that may cause this symptom, most of which are accompanied by coughing, coughing sputum and chest tightness, and can first go to the hospital for examination, to do routine blood tests and also need to take a chest X-ray. If respiratory diseases are ruled out, liver and gallbladder diseases, such as acute hepatitis, gallstones, cholecystitis or cirrhosis, may also cause localized pain, which may increase when pressing on the liver area, accompanied by nausea, vomiting and other symptoms of the digestive system.