In Chinese medicine, there are three organ systems related to anxiety; the Heart, Spleen, and Kidneys. The Chinese view anxiety as worry that has gotten out of control. Each organ system is associated with an emotion, and worry is the emotion associated with the Spleen. The Spleen is also your organ system of digestion.
It sifts and sorts what you’ve eaten, takes what is useful, turns it into nutrients to fuel your body, and gets rid of what is not needed. While your Spleen primarily digests foods, it also plays a role in the sifting and sorting of ideas. While the emotion associated with the Spleen is worry, it is essentially the same as not being able to sort through and let go of unnecessary ideas. Worry is a kind of unhealthy rumination, and when it gets out of control, worry becomes anxiety and fear.
While your Spleen is the organ of digestion, your Heart is the Chinese organ of feelings. We intuitively know that the Heart is an emotional organ. We feel things with all our heart, have our heart broken, or thank someone from the bottom of our heart. Your Heart is home to the Shen, or your spirit, according to Chinese theory.
Its function is similar to that of your brain in Western bio medicine. As such your Heart is the home to consciousness, memory, emotions, and thinking. Whenever someone suffers from any kind of emotional upset or condition, such as anxiety, the Heart is always involved.
Finally, the Chinese Kidney also plays a role in anxiety in a couple of ways. First, the emotion related to the Kidney is fear, which is the underlying component of anxiety. Secondly, the Kidney is the deepest and most nourishing of our organs. It’s responsible for how well you age, your underlying body constitution, and is the source of all the fundamental substances in your body, such as Yin, Yang, and Essence. Your Kidney is the organ system most damaged by stress and anxiety. The Western condition of adrenal fatigue (from stress, anxiety, overwork, etc.) correlates to a severe Kidney depletion in Chinese medicine.