These include conditions include: Monitoring pain under the left rib cage is important. Some causes, like gas or muscle ...

An uneven rib cage can occur for a variety of reasons. Poland syndrome is a rare disorder that causes a person to be born with missing or underdeveloped muscles on one side of the body.

The following are emergency causes of pain under the left rib cage: Heart Attack A heart attack occurs when blood flow to the heart is blocked, leading to damage or death of heart muscle tissue.