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Cancer Health Center

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Pituitary Tumors Treatment (PDQ®): Treatment - Patient Information [NCI] - General Information About Pituitary Tumors


Having certain genetic conditions increases the risk of developing a pituitary tumor.

Anything that increases your risk of getting a disease is called a risk factor. Having a risk factor does not mean that you will get cancer; not having risk factors doesn't mean that you will not get cancer. Talk with your doctor if you think you may be at risk. Risk factors for pituitary tumors include having the following hereditary diseases:

  • Multiple endocrine neoplasia type 1 (MEN1) syndrome.
  • Carney complex.
  • Isolated familial acromegaly.

Signs of a pituitary tumor include problems with vision and certain physical changes.

Signs and symptoms can be caused by the growth of the tumor and/or by hormones the tumor makes or by other conditions. Some tumors may not cause signs or symptoms. Check with your doctor if you have any of these problems.

Signs and symptoms of a non-functioning pituitary tumor

Sometimes, a pituitary tumor may press on or damage parts of the pituitary gland, causing it to stop making one or more hormones. Too little of a certain hormone will affect the work of the gland or organ that the hormone controls. The following signs and symptoms may occur:

  • Headache.
  • Some loss of vision.
  • Loss of body hair.
  • In women, less frequent or no menstrual periods or no milk from the breasts.
  • In men, loss of facial hair, growth of breast tissue, and impotence.
  • In women and men, lower sex drive.
  • In children, slowed growth and sexual development.

Most of the tumors that make LH and FSH do not make enough extra hormone to cause signs and symptoms. These tumors are considered to be non-functioning tumors.

Signs and symptoms of a functioning pituitary tumor

When a functioning pituitary tumor makes extra hormones, the signs and symptoms will depend on the type of hormone being made.

Too much prolactin may cause:

  • Headache.
  • Some loss of vision.
  • Less frequent or no menstrual periods or menstrual periods with a very light flow.
  • Trouble becoming pregnant or an inability to become pregnant.
  • Impotence in men.
  • Lower sex drive.
  • Flow of breast milk in a woman who is not pregnant or breast-feeding.
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