I had constant pains in all joints. Even on flat ground, let alone in the hills. And I started taking vitamin C, at least 1 gram per day. Pains disappeared after a few weeks. Now, after a year they reappeared, and I started with the vitamin again. Tested and it works, and not just for me...if no cartilage wear,...anyway, no tangible cause.
Try it, maybe it helps.
Best