Please see website recommended in the second post.
The lymphatic system, (esp. the thoracid duct)is responsible for draining the thyroid and of course the rest of the body's daily produced metabolic waste products and dead cells. Hypothyroidism almost always relates to inadeqaute lymph drainage for various reasons, such as poor digestion due bile duct congestion, inadequate nourishment, lymph congesting foods, sedentary lifestyle, etc. (sey my books THe Amazoing Liver & Gallbladder Flush, and Timeless Secrets of Health & Rejuvenation. Hypothyroidism also relates to not expressing certain emotions and feelings, standing for one's needs and desires.