What Do Low TSH Levels Mean?

By Staff WriterLast Updated Apr 12, 2020 10:58:51 AM ET

According to About.com, low levels of TSH, or thyroid-stimulating hormone, occur when the pituitary gland shuts down TSH production due to high levels of thyroid hormone in the blood. The low levels of TSH are the pituitary gland's attempt to keep thyroid hormone levels normal within the body.