At present, in clinical practice, there is no evidence to show how much a pituitary tumor can grow in a year, because the specific pathological nature of pituitary tumors varies, the overall health status of an individual differs, as well as whether a corresponding disease mechanism has developed, and whether regular treatment has been administered. These factors definitely influence the pituitary tumor. For some benign or non-functioning pituitary tumors, the growth is very slow after certain treatments, and they will not recur or grow after surgical intervention. However, sometimes, malignant pituitary tumors can grow very quickly within a year, significantly affecting the surrounding nerve tissues due to compression. Therefore, it is crucial to have regular follow-ups or seek early treatment if a pituitary tumor is present, as this is the best approach to treatment.