The hypothalamus controls the autonomic nervous system.
The autonomic nervous system is the portion of the nervous system responsible for maintaining homeostasis.
Thus, damage to the hypothalamus results in severe imbalances in the internal environment.
The hypothalamus contains the thirst center, the hunger center and the body's thermostat.
Thus, damage to the hypothalamus frequently results in water, glucose and temperature imbalances.
The hypothalamus controls the hypophysis (pituitary gland).
The hypophysis is the most important endocrine gland in the body and is often referred to as the "master gland".
The hyopohysis is referred to as the master gland because it controls most of the other endocrine glands in the body such as the thyroid, adrenal gland, testis and ovaries.
By controlling the hypophysis the hypothalamus exerts control over most endocrine glands.
The control of the hypophysis by the hypothalamus is the best example in the human body of the big boss nervous system (hypothalamus) controlling the little boss endocrine system (hypophysis).
The hypothalamus is the site of emotions and the effect emotions can have on the body.
Love for example is nothing more than a temporary disorder of the hypothalamus and is easily curable (by marriage!☺).