The muscles in the back of your tongue help you make certain sounds, like the letters k and hard g (like in the word go). Try saying these letters slowly, and you'll feel how the back of your tongue moves against the top of your mouth to create the sounds. The back of your tongue is important for eating as well.
The most common cause is a benign tumor in your pituitary gland, which is located under your brain. This tumor is not cancer. Because of the tumor, your body makes too much growth hormone. Once in a while, tumors in the pancreas, liver, or parts of the brain can cause high levels of growth hormone. That leads to higher levels of another hormone, called insulin-like growth hormone, which causes the symptoms you see.
The pituitary gland is sometimes called the master endocrine gland  because it makes hormones that affect the way many parts of the body work. It also controls hormones made by many other glands in the body.Pituitary tumors are divided into three groups: 1  Benign pituitary adenomas: Tumors that are not cancer.2  These tumors grow very slowly and do not spread from the pituitary gland to other parts of the body.t also controls hormones made by many other glands in the body. Pituitary tumors are divided into three groups: 1  Benign pituitary adenomas: Tumors that are not cancer. 2  These tumors grow very slowly and do not spread from the pituitary gland to other parts of the body.