Hello all I am having surgery in 2 weeks to remove a grade 2 3cm tumour on my left kidney. I'm a runner and cyclist and have noticed a greater level of fatigue both during and after my normal workouts in the last 6 weeks. Or I'm just a bit out of shape for various reasons (including the mental stress side).  I was wondering if a small tumour (80% endophytic) can cause higher levels of fatigue for 'recreational athletes' such as myself?