Some people who've had thyroid autoimmune disease say they can feel when their body is starting to relapse—even before blood tests show it. It's like their body gives them an early warning signal.

People with autoimmune thyroid disease can often tell when their condition is flaring up based on how they feel, even before blood tests show it.

Some people with Graves disease, an autoimmune condition that makes the thyroid overproduce hormones, can suddenly stop needing medication because their thyroid starts working normally again—even though their immune system is still attacking it.