Can you explain the symptoms and treatment for hypopituitarism, which my dad has been diagnosed with?

Many hormones: The pituitary makes many hormones that control adrenals (cortisol), thyroid, growth hormone, reproductive hormones, and more. Hypopit is an imprecise term but means that some or all of these hormones are deficient, with symptoms associated with the specific hormones. Cause can be tumor, trauma, radiation, other diseases. The hormones need to be replaced under the care of an endocrinologist.