An enlarged pituitary gland may cause symptoms such as headaches. Because the growing gland often presses on the optic nerve, which passes above the pituitary gland, loss of vision may occur. Vision loss often initially affects only the upper, outermost fields of vision in both eyes.
Underproduction or overproduction of pituitary hormones may also occur.
Treatment depends on the cause of the enlargement.
(See also Overview of the Pituitary Gland.)