Hi,
Has a chest xray been done to rule out any rib fracture, chest infection, or air
in the pleural
space?
There could be several causes of the symptoms you are having including a muscle pull, injury or trauma at the site, chest infection, etc.
Do you have any associated symptoms?
You should apply some local pain relief medications, take some oral pain relief medications, maintain a proper posture throughout the day, try some warm compresses.