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A specialist has revealed a surprising side effect being encountered by individuals who routinely use painkillers, such as paracetamol, codeine and ibuprofen.

Dan Baumgardt, senior lecturer at the University of Bristol's school of neuroscience, says GPs frequently observe this symptom.

He explained that, whilst people consume over-the-counter and prescription medications for pain relief, if they are used for longer than three months, they can trigger ongoing headaches.

Dan stated: "Doctors often see another type of persistent headache that has a clear pattern. Patients report getting repeated headaches that started or got worse after taking painkillers regularly for three months or longer.

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