People also viewed. 1  Talk to a doctor live online for free. 2  Pains in both arms and shoulders. 3  Rash on both arms only.  Both arms ache at 1  night. Ask a doctor a question free online.  Ache in both 1  arms. Causes of swollen both 2  arms. Pains in both upper  arms. Both of my 1  arms ache. Both  arms.
The thyroid hormone process begins when the pituitary gland in the brain produces thyroid-stimulating hormone (TSH). TSH then acts upon the thyroid gland to produce thyroid hormones. The two main thyroid hormones produced are thyroxine (T4) and triiodothyronine (T3). Although the thyroid gland produces more T4 (80 percent) compared with T3 (20 percent), T3 is 300 percent more active than T4 and is the thyroid hormone responsible for increasing metabolism. In fact, much of the T4 is converted into the more active T3 inside the cells of the body.
The thyroid is a little butterfly-shaped gland that lives in the middle of your neck, and it's part of the body's endocrine system, where diabetes also dwells. This system controls your body's metabolism. One of the thyroid's primary responsibilities is to manage your metabolism by producing two thyroid hormones: T3 and T4. An overactive thyroid can cause weight loss, a quick heartbeat, and other signs that your body is on the go a little too much. The opposite, an underactive thyroid, leaves people feeling sluggish, and causes weight gain and slow heartbeat. Essentially, your body's normal equilibrium slows down.