  When stressors are present, they cause delays or phase shifts in the
biorhythms of the body because the body needs to stop its normal habitual work
and mobilize for respond to the stressors. The genetically-inherited weak
organ, being with lowest energy, will not have enough energy to propel the
phase shifts, and they will accumulate there, which will make its functioning
sluggish and its biorhythms weakly integrated. When the accumulated phase
shifts surpass the ultimate level, which the genetically weak organ can
tolerate, its biorhythms will become desynchronized, which will lead to chronic
disease of this organ. This article discusses the dynamic of phase shift
changes caused by stress and uses Lyapounov criteria for stability to evaluate
how close the genetically weak organ is to becoming chronically sick. Both, the
effect of self-calming and irregular self-calming of the biorhythms are
considered.
