Posted 4/6/2016 4:53 PM (GMT -6)
Taking levothyroxine should normally lower the TSH. Here is how it works: TSH stands for thyroid stimulating hormone. It is produced in the pituitary gland in your head. The pituitary monitors the circulating level of thyroid hormones (T3, T4) in your blood. If they are low, it will release more TSH to prompt the thyroid gland to produce more hormone. As the circulating thyroid hormones increase, the pituitary gradually tapers the TSH to maintain a normal range. So, putting more thyroid hormones into the bloodstream (either by increased thyroid activity or by supplementation with levothyroxine) should always result in gradually decreasing TSH.
Lowering the TSH in itself is rarely the goal. The real goal is to get the T3 and T4 in the optimal range to allow your body to function normally.