It requires discipline and persistence to see the result. Superstition or it works To understand and judge it, first have to know the basis of TCM, Taoism. Chinese philosophies always believe that everything including the universe is interrelated and changing all the time. One has to reach peaceful state of mind and harmony with the surrounding to maintain good health. Any harmful thing done to others will bring long lasting mental and physical damage to self at the end.
Human organism is just like a miniature version of the universe.
They are constantly interacting in between the opposing and unifying forces - yin and yang. Health is achieved when the equilibrium can be maintained or sickness will appear when it is out of balance. This is the basic law that human and nature all have to follow. Qi is the life force, which flows through all the yin and yang organs. Deficiency of qi in any organ means that organ is out of balance.