According to ancient Chinese thinking every material system has origin in one of the five elements or their combination.
These elements are: wood, fire, earth, metal and water. Their connection to the organs can be seen in the following table:
There exists a tight connection web between the elements. Every element influences the others in a complex way. If an energy path gets totally blocked it will not only affect the organ that is linked to it but sooner or later the other organs.

The following figure illustrates the process: The continuous line represents strengthening and the intermittent line weakening. Therapy of the liver (wood) will also strengthen the heart (fire) but will weaken the energy flow in the lungs (metal).
What is important here is balancing the whole system. Under- or overstimulating are both as bad.

5-el fig