Vague pain on the right side of the chest is usually due to right chest chest wall diseases, digestive system diseases, but also can be seen in the heart disease and lung disease and so on. 1. Chest wall diseases (1) Sternal lesion: sternal fracture, benign tumor of sternum and malignant metastatic tumor in early stage can appear vague pain in right chest. (2) Right costochondritis: localized swelling, dull pain and vague pain at the junction of costochondral and right sternum. (3) Right intercostal neuritis: pain along the anterior branch of the intercostal nerve reaches the right side of the chest, may be vague pain, may be accompanied by skin herpes and so on. (4) Female right breast disease: breast hyperplasia, breast cysts or early breast cancer pulling muscles and fascia can also cause vague pain on the right side of the chest. 2. Digestive system diseases: hepatitis, liver abscess, cholecystitis, reflux esophagitis, acute pancreatitis and other diseases involving pain can reach the back of the sternum and the lower part of the raphe to appear the right side of the chest hidden pain discomfort. 3. Heart disease: congenital heart disease or coronary heart disease with right ventricular hypertrophy, due to myocardial ischemia and hypoxia, there may be hidden chest pain, and the pain area may spread to the right side of the chest. 4. Lung diseases: inflammation of the lungs adjacent to the right side of the chest, lung cancer stimulates the pleura and the tissues behind the sternum causing vague chest pain. For vague pain in the right side of the chest, it is recommended to go to the hospital for further diagnosis and treatment.