Hello, and welcome to HCM!
Pain in this area could be caused by a cracked/broken rib, a kidney infection
, or several other problems. It is difficult to say without examining you. If the symptoms you describe are the only ones (no fever
, painful urination, etc) then infection is less likely. I would recommend seeing your family doctor, who may decide to do x-rays to make sure you don't have a broken rib.
I wish you good health, and thank you for posting on HCM!