It would be weird but most often taken painkillers can end causing constant and severe headaches. Experts are concerned that over one million people in UK might be a victim of such headaches, as they are far too inclined towards painkillers.

As per findings of National Institute for Health and Clinical Excellence (Nice), subjected as guidelines for the health service in England and Wales, people who more often rely on painkillers for headaches or migraines, are actually worsening their case.

NICE affirmed that at least one in 50 cases experiencing persistent headaches is due to drug overdose. It further asserted that if the painkillers are taken continuously for over three months, then they land up causing the same problem for which they were treating, as the sufferers might get resistant to it.

Martin Underwood, Chairman of the guideline development group, said, "Patients with frequent tension-type headaches or migraines can get themselves into a vicious cycle, where their headaches are getting increasingly worse, so they take more medication which makes their pain even worse".

Further, Underwood mentioned the names of painkillers, which heightens the risk, including paracetamol, aspirin and ibuprofen. The drugs are believed to be risky if taken alone or in combination with other drug for 15 days or more.