One of the problems I have seen, particularly after long riding is a sore neck as a result of having to bend your head (esp. when you are in the drops).
As a result, the neck is "kinked" usually to one side.
Some call it Scheuermann's neck (also "Shermann's neck).
It is apparently temporary although it may be a form of "Scheuermann's disease" or "Scheuermann's kyphosis."
Have you ever suffered from it? If so, what did you do to correct it?