after kidney cancer

Hi, I had a partial nephrectomy 5 months ago for renal cell carcinoma. 

I was told the cancer was low grade and had not spread , wich is fantastic.

Recovery was good, iv had some blood pressure issues that I had previously,  but apart from that everything has healed great.

Up to now since healing I have had no pain, but a couple of weeks ago I started to get intermittent spasms in my side. Now its a pain , as if something is pushing under my rib and waist. It is very uncomfortable 

Is this just part of the healing still do you think or is it something I should be concerned about? .

I would really appreciate your thoughts.

Many Thanks.