ANXIETY HAS FAR REACHING EFFECTS ON THE BODY THAT INCLUDE MUSCLE TENSION and HEADACHES.Why does this happen? Anxiety is a form of the "fight/flight' response. Under normal conditions this reaction to danger is useful in preparation for either running away, or getting ready to fight. The result is a contracted abdomen, raised shoulders, contracted neck muscles, and a clenched jaw.
IF however this "threat" (whether actual or perceived) is a constant stressor it begins to affect the muscles in a chronic way. Clients talk about always having "tense shoulders" and not remembering how they got up around their ears! Low grade anxiety seems to have plagued society today.
Imagine what it would be like if we Could feel the process happening, become Aware, and Reduce it before it causes pain and headaches.
See this YouTube video on how the neck and shoulders relate: