Why is TSH low in Graves disease?

If you have Graves' disease, your thyroid-stimulating hormone (TSH) level will probably be very low because the pituitary gland will try to compensate for the excess T3 and T4 hormones in the blood. It'll stop producing TSH in an attempt to stop production of the thyroid hormones. read more

If you have Graves’ disease, your thyroid-stimulating hormone (TSH) level will probably be very low because the pituitary gland will try to compensate for the excess T3 and T4 hormones in the blood. read more

Once you understand these thyroid basics, it's easier to understand what a low TSH and a high TSH reveal about your thyroid's function. Since TSH raises thyroid hormone levels and keeps the system in normal balance: A high TSH suggests your thyroid is underactive (hypothyroid) and not doing its job of producing enough thyroid hormone. The excess TSH is working to stimulate your thyroid to produce more thyroid hormone. read more

Graves’ disease with hyperthyroidism is characterized by the presence of diffuse thyroid enlargement, suppression of pituitary TSH, elevations of thyroxine (T 4) and/or triiodothyronine (T 3), the presence of TSH receptor antibodies in the blood, an elevated radioactive iodine uptake by the thyroid gland and clinical symptoms such as weight loss, increased perspiration, anxiety, tremor, rapid heart rate and frequent bowel movements. read more