How do the pituitary tumors occur?

Don't know: Most pituitary tumors occur spontaneously without any underlying known cause.

Loss of control: The cells of our pituitary gland are constantly producing and simulating and functioning within defined limits. Sometimes, these limits break down with a loss of control. The exact cause for this loss is unclear. But when it occurs, the normal function gets out of control, normal growth gets out of control, and normal production gets out of control. These collections of cells become tumors.