Paracetamol causes headaches!: "Popular painkillers such as aspirin and paracetamol may cause the headaches they are supposed to treat. A paper published in the latest issue of the medical journal Australian Prescriber claims the recommended daily dose of some over-the-counter medications can cause headaches. "Medication-overuse headache is estimated to be responsible for 30 per cent of chronic daily headache and accounts for 10-60 per cent of patients attending specialist headache clinics," said David Williams, director of neurology at John Hunter Hospital in Newcastle. "The prevalence of medication-overuse headache is high and the condition is usually present for a long time before it is recognised and treated." Dr Williams said the body adapted to regular use of painkillers and became less responsive to medication. "When people stop taking the substance, the body suffers withdrawal symptoms," he said. "And the main symptom of withdrawal of analgesics is headache".