It is called
rebound headache. What happens in rebound headaches is someone takes
medications to treat headache and, essentially, they become so used to that
medication that when they don't have it, they actually get a headache going
through withdrawal without that medicine. Rebound headache is a common
problem, but it is one that is not diagnosed that often for the very reason
that many people are not aware that this is an issue. So, rebound
headache is something that doctors often look at and know that it can be a
serious issue.
