Pituitary gland is a small pea shaped gland located at the base of the brain behind your eyes. It is the master gland which secretes hormone that control other Endocrine Glands-Thyroid, Adrenal gland, ovary, testes. And secretes hormones that regulate body water and for milk production.
Some disturbances would lead to major health problem. High Prolactin Hormone or milk hormone if increased in other times of the lifecycle, non-pregnancy will lead to menstrual irregularity and infertility.