Pituitary gland flattening can be divided into the following categories of causes: 1. It is a physiological condition because the cell division and value-added capacity of the pituitary gland will be greatly reduced with age, and the water and fat content of the pituitary gland will decrease with age. In addition, the vascular nerves distributed in the pituitary gland will also have some atrophy or even degeneration, and these combined factors can lead to flattening of the pituitary gland. 2, because of diseases in the brain, such as common pituitary tumors or brain tumors, cerebellar tumors, pontine basal tumors and so on. Because when there are these tumors, the tumor will also produce some pressure on the pituitary gland, resulting in impaired blood circulation to the pituitary gland. As a result, the pituitary gland cannot receive sufficient nutrition, which can lead to a large number of apoptotic necrosis of pituitary cells, causing the pituitary gland to become smaller in size, which can lead to the abnormal condition of flattening of the pituitary gland.