Atrophy refers to the normal development of organs, tissues and cells become smaller in size, there are various reasons for atrophy, some are physiological atrophy, some are pathological atrophy. Physiological atrophy mainly occurs in the process of people’s growth and development, some organs and organs in the body will gradually become smaller, such as the thymus organ is very developed in childhood, with the growth of age, the thymus gland will gradually shrink and become smaller, which is a normal phenomenon. Most of the atrophy belongs to pathological atrophy, for example, brain atrophy is with the age and brain nutrient insufficiency, there will be the brain tissue of the small, which seriously affects people’s life and physical health. There is also muscle atrophy is injured or bedridden for a long time, there will be wasteful muscle atrophy, will make the muscle tension weakened, support weakened, people’s strength is also smaller, can be restored through exercise. There are also other organs atrophy, which will affect the human body in different degrees. Therefore, for the occurrence of organ or tissue atrophy, it is necessary to actively examine, identify the disease, and carry out symptomatic treatment.