Anicca (Pali); impermanence is one of the essential doctrines or Three characteristics of existence in Buddhism. The term expresses the Buddhist notion that every conditioned existence, without exception, is inconstant and in flux, even gods.
According to the impermanence doctrine, human life embodies this flux in the aging process, the cycle of birth and rebirth (samsara), and in any experience of loss. The doctrine further asserts that because things are impermanent, attachment to them is futile, and leads to suffering (dukkha). Under the impermanence doctrine, all compounded and constructed things and states are impermanent.
Impermanence is intimately associated with the doctrine of anatta, according to which things have no fixed nature, essence, or self.