A tension is the most common reason for a headache. It can cause mild, moderate or intense pain in your head, neck, behind your eyes. The majority of people who suffer from tension headaches, observes it occurring once or twice in a month on an average. However, tension headaches can also be chronic; it can last for more than 15 days a month. It is uncomfortable and tiring, but do not usually disturb sleep. People can even carry on working with a tension headache.
