The Lung Meridian is one of 12 meridians in the Traditional Chinese Medicine (TCM) Zang Fu organ model. The primary Lung channel runs from the center of the chest, up through the throat, down the medial-lateral side of the arm, all the way to the thumbnail.
In TCM, each organ pair is associated with specific emotions, and the Lung meridian is specifically linked to grief and sadness. Because of this, acupuncturists often needle points along this channel for patients struggling with these emotional burdens.
In Western medicine, we are naturally skeptical of the idea that seemingly arbitrary points on the arm can resolve negative emotions. Yet both acupuncturists and those who have received acupuncture have experienced the reduced feelings of grief and sadness upon needling the Lung meridian. So how can this phenomenon be explained through modern anatomy and neurology?
The Western Medical Explanation
While a complete neurophysiological breakdown requires more than a short blog post, we can understand the loose framework through a few key concepts:
First, acupuncture points are frequently located over anatomical intersections where dense clusters of nerves, arteries and veins converge.
The C5-T1 bundle of spinal nerves (the brachial plexus), located right underneath the armpit and through the thoracic outlet, is largely involved in two critical functions:
- The motor control of breathing mechanics and chest posture.
- The sympathetic innervation of the lungs and heart.
When a person experiences deep grief or sadness, the limbic system (the brain’s emotional center) triggers a protective, depressive posture. This can cause the chest to slump, the shoulders to round forward and breathing to become shallow. This combination can ultimately compress the thoracic outlet. When this bundle of nerves is chronically compressed by poor, emotion-driven posture, one can feel a heavy ache, tightness, or nerve pain in the chest that may even run down the arm and into the thumb (the pathway of the Lung meridian).
Furthermore, the somatic nerves supplying the thoracic outlet and the rest of the arm share spinal cord segments with the sympathetic nerves that regulate the lungs (a phenomenon known as neural convergence). Meaning: tension in these physical areas can actively feed back into distress in an internal organ, such as the feeling of restricted breathing that some experience during grief and sadness.
Where does acupuncture come in?
By placing acupuncture needles along the anatomical path of the Lung meridian, practitioners stimulate superficial mechanoreceptors and sensory nerves. This sends a neurological signal back to the spinal cord that interrupts the chronic loop of pain and tension, relaxes the compressed thoracic outlet, down-regulates the sympathetic nervous system, and allows the patient to breathe more deeply.
