J .K. Rowling wrote in Harry Potter and the Goblet of Fire, “Numbing the pain for a while will make it worse when you finally feel it”. Without going into the metaphorical explanation of the saying, the literal meaning of these words is very important and relevant.
Pain in any part of human body is not a disease in itself but it’s an indicator that something is wrong in the body. We can understand it from a common everyday example. If you are driving your car and check engine lights comes on. What would you do? Will you ignore the light and keep driving or you will cover the light with a tape or unplug the wires or you will take your car to an auto-mechanic as soon as possible. You will agree with the last option because you want the problem being signaled by the check engine light to be sorted out and handled. Similarly, if you are feeling a pain in your back or neck, why would you want to mask the pain with pain killers or just ignore it hoping that it would go away on its own?