When you have finished treatment and something is not right . Who do you see?

I saw my surgeon and oncologist once every 6 months, scheduled so I saw one of them every 3 months. I could of course see them more often if there was a problem or go to my GP as required. Now that I am 4 years on, scheduled visits are every 12 months, so 6 months between seeing someone. I expect this may change again after 5 years. But you should see someone if you have any concerns at all. Not sure who though, depends on the problem, maybe oncologist as first start?