In Chinese medicine the Liver is responsible for spreading: the smooth movement of bodily substances and for the regularity of body activities. It maintains evenness and harmony of movement throughout the body. The Liver is vital for Blood movement and is also the organ most sensitive to stagnation. This condition can cause swelling and pain, Gall Bladder dysfunction, emotional imbalances and affects menstrual blood flow. The Liver and Gall Bladder are associated with the colour green and the element Wood. Particularly when in disharmony, they produce the emotions that are ascribed to Wood: irritability, anger, fury, hatred and rage. The Liver also provides for the health of other parts of the body associated with Wood: the tendons and ligaments, nails and the eyes.