Whether diabetes will disappear after pituitary tumor surgery needs to be divided into situations. If the patient has elevated blood sugar caused by pituitary tumor, then it is possible for blood sugar to return to normal level after surgery. Pituitary tumor is a tumor originated from the pituitary gland, most of the pituitary tumors are benign, pituitary tumors cause hormone secretion abnormality may cause elevated blood glucose, at this time, the pituitary tumor can be resected, and the patient’s blood glucose level can be restored to normal after effective treatment. However, for patients with diabetes, such as type 1 diabetes, type 2 diabetes, etc., their blood sugar will not return to normal even after pituitary tumor removal, and they still need to be treated with medication under the guidance of the doctor. Patients diagnosed with pituitary tumor and diabetes should actively cooperate with the doctor for treatment.