Last month, a Cochrane Review was updated and published about acupuncture and stress headaches. This review looked at twelve different medical trials which included 2349 patients.
The conclusion was wonderful!
"The available results suggest that acupuncture is effective for treating frequent episodic or chronic tension-type headaches..."
For the last 30 years, Advances in Experimental Medicine and Biology has been publishing experimental and ground-breaking medical research. The most recent publication, Oxygen Transport to Tissue XXXVII, has a chapter looking at acupuncture and anxiety.
The research focuses on oxidative-hemoglobin (oxy-Hb) concentration of the pre-frontal cortex. This section of the brain in near the forehead and responsible for decision making, social behavior, personality, and cognitive actions. Changes in oxidative-hemoglobin indicate metabolic activity in this brain region. Using imaging (near-infrared spectroscopy) researchers observed changes in this area of the brain on those during and after acupuncture sessions.