The Master always talked to me about moderation in all walks of life. Not too much Yin or too much Yang they would say you have to have balance in your life to be healthy and live a long life without pain and suffering.
If there is a blockage mentally, physically, emotionally or spiritually it will affect the smooth flow of Qi and a blockage of energy will surely ensue, resulting in some form of dis-eas of body, mind or spirit.