It is the abnormal growth of the tumors formed inside the pituitary gland. Some pituitary tumors produce too many hormones that regulate the essential functions of your body. In pituitary tumors, the pituitary gland may produce lower levels of hormones. Most pituitary tumors are non-cancerous growths (adenomas). The adenomas remain in the pituitary gland or in the surrounding tissues and do not spread to other parts of your body. There are several options for treating pituitary tumors, eg. For example, the removal of the tumor, the control of its growth and the control of its hormone levels with drugs.