Ayurveda, the holistic healing science propagates health for all with the aim of prevention is better than cure. Ayurveda explains the concept of seasonal regimens which help us to maintain the quality of life.The severity of heat and cold vary in each seasons. These changes affect the level of doshas (three basic constituents of functioning of the body in Ayurveda namely vata, pitha and kapha) in the human body.

Eventhough the seasonal variations are considered natural it will affect the equilibrium of doshas in the body and produces certain symptoms if not managed properly. This can be corrected by making changes in the life style. If these are neglected it will produce disease.In Ayurveda the year is divided in to six seasons (ritu) and each season consist of two months. These are Sisira (Late winter), vasantha(Spring), greeshma(Summer), varsha(Rainy season), sarat(Autumn) and hemantha(Early Winter).

Based on earth movement seasons are divided in to two groups, Adana kala (sisira, vasantha, greeshma) when earth moves closer to sun and heat is felt more and Visarga kala (varsha, sarad, hemantha) which consists of cooler seasons. According to modern calendar the seasons of Ayurveda starts with middle of January (start of Sisira ritu) to Middle of November (Hemantha ritu).Season or time of the treatment both external therapy and internal medication is an important factor in Ayurveda. The treatment done without looking season will be pointless. So it should be done in proper time except in emergency condition.
 
Two weeks before and after the period of each season has also to be considered. During this period treatments like vamana(medicated emesis), virechanam(induced laxation), dhara (pouring of medicated oil or decotion or milk or buttermilk on head or body), pizhichil (pouring of warm medicated oil on body along with massage), navarakizhi (massage with special bundle made of navara rice processed with milk and sida cordifolia), snehapanam (intake of medicated ghee), vasthy (enema), siravedham (mild surgical incision of veins inorder to remove impure blood) can be done along with internal medication.

There is an another opinion that treatment done in Varsha   for the diseases due to vitiation of three doshas ,in Sarad  for the diseases due to pitha vitiation and in for the diseases due to kapha vitiation should have more effect.In emergency conditions treatment can be done without looking for suitable season, but should take precautions to protect patients body from extreme cold, hot and rain if it persist. Treatments in which strict regimens are not needed also can be done in all the seasons.