Impermanence, called anicca (Pāli) or anitya (Sanskrit), appears extensively in the Pali Canon[1] as one of the essential doctrines of Buddhism.
[1] Anicca is understood in Buddhism as the first of the three marks of existence (trilakshana), the other two being dukkha ('unease', from dushta, "standing unstable") and anatta (non-self, non-soul, no essence).
[1][7][8][9] Human life embodies this flux in the aging process, the cycle of repeated birth and death (Samsara), nothing lasts, and everything decays.
[12][13] According to Buddhism, everything in human life, all objects, as well as all beings whether in heavenly or hellish or earthly realms in Buddhist cosmology, is always changing, inconstant, undergoes rebirth and redeath (Samsara).
The Buddha taught that because no physical or mental object is permanent, desires for or attachments to either causes suffering (dukkha).