Pain in left side of ribs and under left arm pit. belly button swollen and tender.

Doctor can examine: If one has uncomfortable tummy symptoms, and is normally in good health, plus is not pregnant, some possibilities include: abdominal wall muscle problems, bad constipation, stomach flu, appendicitis (usually right lower tummy), colitis, gall bladder problems, etc... Most people with moderate (more than mild) pain, or recurring symptoms, need a doctor's exam to be sure it is not something serious.