Antibodies from people with Graves’ disease make thyroid cells way more active in a lab dish — like turning the volume up to 11 — by directly pushing the thyroid’s main control switch.

Even in people with Graves’ disease, the thyroid still responds to its main hormone signal — TSH — by producing a key internal messenger, showing the system still works in lab tests.

In Graves’ disease, the immune system makes faulty antibodies that trick the thyroid into overproducing hormones, causing it to go into overdrive.

In Graves’ disease, certain antibodies in the body mistakenly turn on the thyroid gland and can also affect the eyes, causing swelling and bulging — it's like the immune system accidentally hits the gas pedal on both the thyroid and eye tissues.

In Graves’ disease, certain immune proteins can mistakenly attack eye tissue, causing swelling and bulging eyes.

When someone has Graves’ disease, their thyroid hormones get too high, which tells the brain to stop making a hormone that stimulates the thyroid — so that hormone ends up being very low or even missing in blood tests.