Tension headaches result when the musdes of your scalp or the nerves supplying them release lactate, serotonin, bradykinin and prostaglandins, any of which significantly lower the pain threshold.
Headaches are so common we tend to dismiss them as an annoyance, rather than a condition that needs serious treatment. However, a headache, like any pain, is the body's way of telling you something's wrong. Another myth is that a headache is a...