Description of the etiological factors as ‘Trividha-Het?’ is unique classification in ?yurveda. Amongst these three factors K?la (time-factor) is beyond the reach of human. It is unavoidable. It is the root cause of climatic changes which we called as seasons i.e. ‘?TU’. Such climatic changes are responsible for development of various signs & symptoms which are known as ‘symptoms due to season change’. To avoid these seasonal illness & maintain health throughout the year, seasonal regimen i.e. ?tucary? is described in ?yurveda. Some signs and symptoms or diseases are likely to occur during the joining period of two consecutive ?tus, specified for two weeks and termed as ?tusandhi. If one disobeys these rules, particularly in ?tusandhi then he mostly suffers from the typical signs and symptoms termed as As?tmyaja Roga in ?tusandhi. Study & practice of ?tucary? helps to prevent the onset of signs and symptoms i.e. ‘As?tmyaja Roga’ in ?tusandhi. This book is based on the fundamental concepts of ?yurveda with survey study of 100 individuals particularly in 3 ?tusandhis. The detailed ?tucary? is also illustrated in this book.