Answer: Pulmonary embolism
Explanation:
Pulmonary embolism is a medical condition in which clots form in the blood vessel of lungs. As per the complaint by the client, that he was feeling pain in the left side of the chest.
This could have occurred due to clotting in the major blood vessel which is found in lungs. Most of the time clots are not deadly but they do damage the lungs which causes pain.
As the patient was not taking blood thinners due to operation, clots might have formed in the lungs known as pulmonary embolism.
