Over secretion of the pituitary gland causes gigantism and under secretion of the pituitary gland is causes dwarfism.
Since pituitary gland is often called the master gland because it controls several other hormone glands in your body, including the thyroid and adrenals, the ovaries and testicles.For example, if the pituitary gland does not produce enough growth hormone in a child, they may have a permanently short stature. If it doesn't produce enough follicle-stimulating hormone or luteinizing hormone, it might cause problems with sexual function, menstruation, and fertility.
Noncancerous pituitary tumors are the main cause of pituitary disorders. Tumors often cause your body to make too much or too little of a hormone, leading to a disorder such as acromegaly.
Other common causes of pituitary disorders include: Head injury.