People who consume high amounts of caffeine each day are more likely to suffer occasional headaches than those with low caffeine consumption, a team of researchers at the Norwegian University of Science and Technology (NTNU) reports in a study recently published in the Journal of Headache Pain. It is also reported that low caffeine consumption was associated with a greater likelihood of chronic headaches, defined as headaches for 14 or more days each month. The relationship between caffeine consumption and headache provides no relief to headache sufferers wondering whether they should drink more coffee or less. Some studies have shown that high caffeine consumption increases the prevalence of headaches and migraines, while other studies have shown no such relationship. At the same time, headaches are costly to society, in work hours lost, and to individuals themselves. The World Health Organisation ranks migraine 19th in all causes of disability based on a measure called "years lived with disability", as one example. People who suffer from headaches should be focused on their caffeine use, because it can be a cause of their headaches, says in the research.