First of all you will have to develop the listening skills for hearing their side of the story. Give the person the feeling that you really care about them as they are in need of your empathy rather than your sympathy.
Try to talk them out of their grief. Initially, most patients are in the denial mode, but as reality dawns upon them, they start getting more and more gloomy. The ideal way to keep the patients happy and gloom-free is to talk less and less about the disease.
Just keep them busy in conversations and occupied in some activity. However, don’t except the patient to be all smiles and full of life.
Schedule their appointments with doctor and always be present in those sit ins. Doctors may sometimes not pay much attention to what the patient has to say as they are focused on reading their body language, and their physical condition. So you should explain the symptoms to the doctor and ask them about ways on how to reduce pain while lifting objects.