A pituitary tumor can also affect the thyroid, causing hyperthyroidism. Symptoms of hyperthyroidism include abnormal sweating, abnormal weight loss, abnormal bowel movements, and an irregular heart rate. An overactive thyroid is also called Grave's disease. If the thyroid is the primary cause of Grave's disease, this gland in the neck will often swell. A pituitary tumor may be identified as the cause of the condition when this swelling does not occur.

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