The classification and performance of pituitary tumor should be analyzed according to the specific situation.1 The simplest type of pituitary tumor is non-functioning adenopituitary tumor. This kind of pituitary tumor has no endocrine function, but only the increasing volume, which causes the performance of headache, dizziness, and even some will appear nausea and vomiting. If the pituitary tumor breaks into the saddle diaphragm, or even worse, compresses the visual crossover, then there will be visual defects and visual field disorders.2. Prolactin-type pituitary tumors will secrete prolactin, which will cause male lactation, female menstrual irregularities, and even infertility.3. Growth hormone-type pituitary tumors will secrete growth hormone, which will lead to characteristic manifestations such as the enlargement of the end phalanges and the enlargement of the lower jaw and the nose, and even some people will develop the growth hormone, and even some people will have the symptoms such as headache, dizziness, nausea, vomiting, and so on. Some people may even have excessive growth, resulting in gigantism.4. Thyroid-stimulating hormone type pituitary adenomas may cause hyperthyroidism and enlargement of neck.