Illness is an unavoidable part of life. Not just humans but also animals, birds and plants fall sick. There are innumerable reasons behind illness. The reasons of sickness can be classified into a few groups. There was a time when science had not progressed much and people used to blame ghosts, spirits and black magic for illness. Even the wrath of divine powers used to be assumed as the reason of illness. According to the ancient Chinese medical theory the imbalance of the five natural elements causes illness. They also believe that we get energy for working from the flow of natural energy. When this energy flow gets stopped we fall severely ill.
