Upper right back pain and neck pain. Is it lung cancer?

I have mild scoliosis and spend several hours a day on the couch watching videos or movies on my iphone. The pain comes and goes. I don't exhibit any other symptoms of lung cancer. I have never done drugs or smoke at all. I don't feel pain when I breath in deeply. There's mild pain in my neck and lower skull. Is it cancer or poor posture and scoliosis?

It's not cancer. If you don't use drugs, don't smoke, and don't spend lots of time around smokers, the risk factor of lung cancer is practically zero. You actually have a higher chance of being struck by lightning.

You guessed correctly about posture. Sitting all day staring at something in your hands will cause a kink in your neck. Take advil or aleve, whichever works better for you. Put a heating pad on it to increase circulation and thus the amount of oxygen and nutrients. Do not use ice, even if it feels good at the time. Ice is used for injuries because it constricts blood flow and reduces swelling. Once the risk of swelling or bruising is no longer a factor, ice can actually make a problem worse.

While your neck is getting better, get some really soft pillows to sleep on. A hard or uncomfortable pillow can cause neck pain even without a preexisting problem. If you can get a massage, that will feel really nice too.