Your pituitary gland, located at the base of the brain, is only about the size of a pea, but it does critical work. “It’s the master hormone gland,” says UNC Health neurosurgeon John Engler, MD. “The pituitary gland controls production of growth hormones, sex hormones and steroid hormones. It produces lactation hormones for breastfeeding and… The post What is a Pituitary Tumor? first appeared on UNC Health Talk.