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.
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