headache, stress

headache, tension A headache previously thought to be caused by contraction of the muscles in the back of the neck, on the scalp, and sometimes in the jaw. The term tension-type headache is now preferred, reflecting the fact that research has shown that these headaches may not be related to muscle tension. Although the cause is unknown, they are believed to be related to the levels of neurotransmitters in the brain and are possibly complicated by tightness in muscles. Stress, lifestyle changes, and changes in sleep patterns are among many possible triggers.