hi, thank you for providing the brief history of you As you have undergone radical nephrextomy and also apicoectomey along with removal of abscess in the jaw you have undergone a surgical procedure which will have its affect on overall health functions As post surgery there is always an advice on the ethical way to deal with weakness and other symptoms. Like undergoing physical therapy for the general body conditioning is a must since you had radical nephrectomy. As due to the surgical procedure there will be weakness in the abdominal muscles which are also the muscles of the respiration. As weakness comes the cardio respiratory endurance falls. Regaining the cardio respiratory endurance is a must to have a functionally active lifestyle. In my clinical practice, once the patient undergoes surgery, we advice them to undergo physical therapy doe general body conditioning and also cardio respiratory endurance training. Which had helped majority of them to be functionally active. Regards Jay Indravadan Patel