You had better get to the hospital. could be serious.
No contributor to this site can diagnose illnesses, diseases or pregnancy over the internet, nor is it the purpose of this site for them to do so. The best that can be offered is general advice which...
Trouble with the stomach or the spleen and in some cases the pancreas.
manything like inflammation(costochondritis),infections of rib,trauma(fracture) and tumors..
Perhaps a Hiatal hernia