Pain inside the rib cage under the right breast of men may be digestive tract diseases, chest diseases, rib cage diseases, etc. 2. Chest diseases: such as right pleurisy, pneumonia, lung abscess, right pleural effusion, pneumothorax, hemothorax, etc., or lung and thoracic cavity occupying lesions such as lung cancer, thoracic diaphragm tumors, etc. can also cause the above symptoms. 3. Rib diseases: such as right-sided costochondritis, the pain may radiate from the back along the intercostal space to the anterior chest wall. In addition to the above diseases, cholecystitis and gallstones can also cause the above symptoms. There may be other reasons for the pain in the ribs under the right breast of men, the symptoms alone can not accurately determine the cause of the pain in the ribs under the right breast, but also need to be combined with the characteristics of the medical history, other test results in order to make an accurate judgment, it is recommended that the cause of the disease under the guidance of the doctor to clarify the cause of the formal treatment.