Tension headache is the most common type of headache. It is pain or discomfort in the head, scalp, or neck, and is often associated with muscle tightness in these areas.Tension headaches occur when neck and scalp muscles become tense or contract. The muscle contractions can be a response to stress, depression, head injury, or anxiety.Any activity that causes the head to be held in one position for a long time without moving can cause a headache. Activities may include typing or other computer wo