Friends generally have this view: infertile women should see the obstetrics and gynecology, infertile men should see the male department or urology; obesity, gigantism or acromegaly and hyperthyroidism should see the endocrinologist. Are the above views completely correct? Our answer is not necessarily. Why? There is a disease that patients and friends do not often hear about, but is not uncommon, pituitary tumor. It can also cause the symptoms mentioned above. The pituitary gland is a very important endocrine organ in our cranium, which secretes prolactin, adrenocorticotropic hormone, thyroid-stimulating hormone, growth hormone and so on. Pituitary tumor can produce three hazards: excessive secretion of pituitary hormones, leading to endocrine disorders, metabolic disorders, etc.; compression of peri-saddle structures, leading to visual field disorders, damage to the hypothalamus, etc.; and insufficient secretion of other pituitary hormones due to the compression of normal pituitary gland by the tumor. Pituitary tumors include prolactin adenoma, growth hormone adenoma, adrenocorticotropic hormone adenoma, thyroid hormone adenoma, and of course adenomas without endocrine function. What are the symptoms of these tumors? Prolactin adenomas can cause amenorrhea, lactation and infertility in women; impotence, infertility and obesity in men. Adrenocorticotropic hormone adenomas can cause Cushing’s disease (centripetal obesity). Growth hormone adenomas cause gigantism in children and acromegaly in adults. Thyroid-stimulating hormone adenomas cause hyperthyroidism. Adenomas with no endocrine function: no endocrine symptoms. If your friend has any of the above symptoms that are difficult to control or explain by internal medicine, a visit to neurosurgery is warranted.