My 72 year old dad had a cabg (4 months) & is recovering but is experience pain near his right breast radiating to the armpit. is there a problem?

Possibly: Patients experience all types of aches and pains after surgery. Often there is rib and muscle pain even in areas away from the incision. It can be difficult to separate these pains from chest pain associated with the heart. Is the pain worse when pressing on the area? Does coughing or sneezing worsen it? It boils down to his surgeon having the best understanding of this.

Possible: He is far enough post op to be well. Sometimes lung, or pleural or chest wall issues surface with increased mobility and the deconditioning of heart disease and surgery.. See the cardiothoracic surgeon get an x-ray and sed rate blood test.