In clinical practice, if the prolactin is greater than 30 μg/L, it is possible that the condition is a pituitary tumor, but it is important to understand the specific trends of the situation. Prolactin is actually relatively sensitive and is easily stimulated by certain abnormalities, such as menstruation, childbirth, lactation, and a host of other conditions, and even some morning and evening measurements are different. Therefore, in order to make a true diagnosis of pituitary tumor, it is not possible to rely solely on one indicator of prolactin for clarification. Very often, it is necessary to combine clinical symptoms, imaging, laboratory tests, and clinical examination together for clarification, so as to better confirm the diagnosis of pituitary tumor, otherwise it is often easy to miss and misdiagnose.