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What problems are caused by a pituitary tumor?
Pituitary tumors may impair or cause an increase in the production of one or more pituitary hormones. The lesion itself can damage surrounding normal tissue and thereby reduce the function of the pituitary gland (a condition called hypopituitarism).
Enlargement of the pituitary gland can also cause local symptoms, such as
headaches (because of increased pressure if the fluid system bathing the brain is blocked or stimulated), or visual disturbances (because of the proximity of the pituitary gland to the optic nerves).