In them? Not at all. But by reading it and understanding probable causes and stretches/exercises that can alleviate or prevent the pain, hopefully things would get better.
That being said, consulting a doctor would still be a good idea. But having something you can do immediately, that gives you tools that could help right away, isn't bad either.
I teach beginning readers, and the best guess I have is, they're sight words (high frequency words that don't follow phonetic rules - you just have to recognize them on sight).
That being said, I don't know what good just having these words around will do. Sure, you have to be able to recognize them, but there's no context if they're just randomly on stairs.