Hi. Thanks for your query. The pain on the right side just under the breast wherein all the investigations of X-ray, ultrasound and blood are normal is most probably due to costochondritis. I would advise you the following: Pres on the part and if there is tenderness, this is costochondritis. The management is: -Rest to the area by means of strapping with the Adhesive tapes during the deep Expiration phase. This will limit the movement, reduce the pain and give rest for healing to occur. -Anti-inflammatory medicines in full dose as per the weight. -Steroids if required for its strong anti-inflammatory role. -Diuretics to reduced the edema. -Control of stress and anxiety helps a lot. -Local rubrafacient liniments if the area is not covered by strapping. -Confirmation of the diagnosis by local Doctor on palpation and clinical evaluation and to get prescription based medicines after discussing the above points. This sort of a treatment helps all my patients. and should help you too.