Chronic (Transformed) Migraine
Chronic migraine is diagnosed if you have migraine on 15 or more days a month over a period of at least six months.
As time passes, some people with migraine may begin to experience additional or almost daily headache. As the frequency increases, the headache pain and other symptoms associated with migraine become milder, but may also become less responsive to treatment.
People will usually experience more typical ‘breakthrough’ migraine attacks on top of the new milder ‘background’ headache. Depression and irregular sleeping are other effects of chronic migraine.