Woke up w/ache left side of rite knee a month ago. Aches/pain sometimes still when walking.18 yrs. Doc only did blood tests. Bone cancer? Not athletic.

See ortho. It would be very unlikely that you have bone cancer because you had knee pain a month ago, especially at 18 yo. You need to see your dr. And tell them to examine your knee or see an orthopedic dr. Generally speaking, it is most likely something common like condromalacia or patellofemoral syndrome, which is common in young individuals that are active, but do not necessarily have to be in sports.