The common causes of right breast subcostal pain can be categorized into traumatic and non-traumatic, non-traumatic factors causing right breast subcostal pain are common diseases such as cholecystitis, gallbladder stones, pleurisy and so on. 1. Traumatic When the right side of the chest has been impacted, squeezed and other violent injuries, it may stimulate the right side of the subcostal nerve and produce pain. 2. Non-traumatic Because the liver and gallbladder are located under the right side of the rib cage, the common diseases that cause subcostal pain in the right breast are mostly related to this. For example, cholecystitis, gallbladder stones, etc. The pain occurs after eating greasy food, and cholecystitis and gallbladder stones should be considered. Pleurisy can also present with a vague pain under the ribs of the right breast, associated with breathing movements, and the pain worsens when breathing. If the symptom persists, it is recommended to seek medical attention, and early ultrasound examination can clarify the diagnosis. According to the diagnosis and under the guidance of the doctor, medication and, if necessary, surgical treatment can be carried out.