What does your oncologist say about it? Does it seems to radiate down your leg from the hip, and if so in the front or the back? Did you have any kind of precipitating event? Does it feel at all electric, or is it a dull bone ache? Is it positional? Is there swelling? It could be many things, including neuropathy, a clot, a pinched nerve, you name it. If you haven't consulted the doctor about it yet, I think you should, and make sure it is taken seriously. No point in being a hero.
I had pain that I would call almost electric--radiating down the front--from a nerve problem, years before CRC. I had wrenched my piriformis muscle, which was putting pressure on an adjacent nerve. Assiduous targeted stretches and so forth did no good. Couldn't sleep without hydrocodone or the like. What finally fixed it was accupuncture, which I think is really great for nerve-related issues.
F, 64 at DX CRC Stage IV
3/17/18 blockage, r hemicolectomy
11 of 25 nodes,5 of 5 mesentery nodes
0.5 cm sub-capsular liver met removed
pT3 pN2b pM1
BRAF wild, KRAS G12D
7/9/18 CT no masses or enlarged nodes, 2mm indeterminate lung nodule
11/20/18 CT same, Lung nodule likely calcified granuloma. Enlarged spleen.
12/20/18 Liver MRI 5mm liver met and 2 lymph nodes in porta hepatis, CT review shows progression of nodes on FOLFOX