Common painkillers could be causing people to have headaches, the health watchdog has warned.
People who regularly take medicines such as aspirin, paracetamol and triptans could be causing themselves more pain than relief, the National Institute for Health and Clinical Excellence (Nice) said.
Medication "overuse" could contribute to headaches for people who have been taking such medicines for up to half of the days in a month over three months, a spokesman said.
The watchdog estimated that one in 50 people who experience headaches suffer because of medication overuse.
Nice said common over-the-counter treatments are effective for easing the pain of occasional headaches but using them for tension-type headaches or migraine can reduce their effectiveness and cause further pain.
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People who suffer from such headaches could be in a vicious cycle where their headaches are getting worse because of medication overuse and to alleviate symptoms they take more drugs.
Issuing new guidance to healthcare professionals, Nice said that different headaches require different treatments and so a correct diagnosis is vital.
More than 10 million people in the UK experience regular or frequent headaches, according to Nice. They account for one in 25 GP consultations.
Martin Underwood, a GP and professor of primary care research at Warwick Medical School who chaired the guideline's development, said: "We have effective treatments for common headache types.
"However, taking these medicines for more than 10 or 15 days a month can cause medication overuse headache, which is a disabling and preventable disorder.
"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 as they take more medication.
"I hope this guideline will improve awareness of medication overuse headache both in primary care and among the general public because prevention is simple and treatment is difficult.
"Explaining to patients that they should abruptly stop their medication, knowing that their headache will get much worse for several weeks before it will improve, is not an easy consultation."
Dr Gillian Leng, deputy chief executive of Nice, added: "Although headache is the most common neurological problem seen by GPs and neurologists, many people are not receiving correct or timely diagnoses.
"The key features of medication overuse and the symptoms that distinguish the types of primary headache can be overlooked and concerns from patients about possible underlying causes can lead to unnecessary hospital investigations.
"These can mean people experience delays in receiving adequate pain relief from what can be an extremely disabling condition.
"Our guideline outlines the assessments and treatments that people should expect to receive for primary headaches and medication overuse. We hope that this will help GPs and other healthcare professionals to correctly diagnose the type of headache disorder and better recognise patients whose headaches could be caused by their over-reliance on medications."
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Peter May, who helped develop this guideline, added: "Having experienced cluster headaches for 12 years and initially being told that I was suffering from migraines, I believe there is a real need for diagnosis to be improved.
"The pain I experience in an attack lasts around 45 minutes to an hour, and is excruciating, like being stabbed in my eye with a red hot poker.
"It took two years for me to receive a correct diagnosis, but I believe I am one of the fortunate ones as I know people who have gone 20 years.
"There are effective treatments available but they differ according to the type of headache and so having a correct diagnosis as soon as possible is crucial."