Painkillers 'cause' of millions of headaches
Up to a million people in the UK have "completely preventable" severe headaches caused by taking too many painkillers, doctors have said.
They said some were trapped in a "vicious cycle" of taking pain relief, which then caused even more headaches.
The warning came as part of the National Institute for Health and Clinical Excellence's (NICE) first guidelines for treating headaches.
Fergus Walsh reports.