Kala or time has always been given the symbolism of a turning wheel because time and season changes in a cyclic fashion. Time always takes its toll on everything, the human body develops and deteriorates with impending time. The ancient literature of Ayurveda mentions the effect on physiological conditions of human beings due to the 'seasonal cycles.' The seasonal conditions, their influence on Doshas at each time and illnesses and dysfunction associated with it as well as the process of aging is included in Parinama or Kala therapy.
Ayurveda calls for the understanding of the specialities and peculiarities of each passing season. Only when the intricacies of each cycle is understood can the person be able to change the lifestyle according to it. If the lifestyle is not in rhythm with the season then the doshic constituency of the body faces a chaotic situation. The aggravated doshic tendency throws health off gear. The Parinama therapy helps to bring balance in human life.
The constantly varying temperature and climatic factors are the foremost reason for many illnesses. The excessive change in climatic conditions such as sweltering heat of summer or excesive chilling in winter leads to Atiyoga or excessive parinama. Thus the balance of the body's health is not in harmony with the climate. The hinayoga or deficiency of Parinama is marked by minute variations in temperature. Mithyayoga parinama is the reversal of conditions in a particular climate. The summers are cold and winters hot which can be of great concern to health. Thus Parinama in Ayurveda is a collective study of these changes and its intricacies along with treatments and therapies with ayurvedic herbs and other medication techniques.