A pituitary tumor is an abnormal growth in the pituitary gland. The pituitary gland is located at the base of the brain. The pituitary gland has different cells in it that make different types of hormones. There are different types of pituitary tumors, depending on which cells are involved.
Pituitary tumors can cause problems in different ways:
- They can make too much of a certain hormone.
- They can press on nearby tissues in the head, such as the nerves that go from the eye to the brain. This can cause vision problems.
- They can press on other cells in the pituitary gland and keep those cells from making enough hormone.