Diabetes insipidus is not high blood sugar levels it is a problem with the ability of the kidney to retain fluid because of a deficiency of the pituitary hormone, vasopressin (also called antidieuretic hormone) that regulates water balance. Occasionally a pituitary tumor causes diabetes insipidus, which results in frequent urination and excessive thirst. A tumor may interfere with normal pituitary function causing hypothyroidism (low thyroid hormone level), adrenal insufficiency (low cortisol level), hypogonadism (loss of sexual function and fertility in men, loss of menstrual periods or fertility problems in women). Headache may occur with a large or a small tumor. Headache may also occur the type of headache varies from patient to patient. A large tumor may cause loss of vision, particularly peripheral vision, if it compresses the optic chiasm (where the optic nerves come together, located above the pituitary gland). This depends on the type of tumor and the size of the tumor.
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