Impermanence (Sanskrit: anitya; Pali anicca; Tibetan: mi rtag pa; Chinese: 無常, wúcháng; Japanese: mujō) is one of the essential doctrines of Buddhism. According to it, everything is constantly in flux. This is embodied in human life in the aging process and the cycle of birth and rebirth (samsara), and in any experience of loss; because things are impermanent, attachment to them is futile, and leads to suffering.
Anicca is intimately associated with the doctrine of anatta, according to which things have no fixed nature.
Anicca, Dukkha, Anatta — Impermanence, suffering and Egolessness — are the three essential characteristics of things in the Teaching of the Buddha.
Anicca is, for the householder, the gem of life which he will treasure to create a reservoir of calm and balanced energy for his own well-being and for the welfare of the society.
In experiencing Anicca in relation to the body, it should first be in the area where one can easily get his attention engrossed, changing the area of attention from place to place, from head to feet and from feet to head, at times probing into the interior.