I am not sure whether they increase only in frequency and duration rather than intensity, due to the
long period of time. In any case, these are
long-
lasting sensations, not very intense, but lasting for hours at a time. They take place most often while I'm sitting down over a book, when I'm slouching, and when I'm wearing overly-tight pants. I am reasonably sure I have no symptoms during exercise.
Sometimes, though rarely, the discomfort is accompanied by headaches.