A thyroid antibodies test reveals situations where the immune system mistakenly attacks the thyroid and can lead to chronic inflammation of the thyroid (thyroiditis), tissue damage, and disruption of thyroid function.
An underactive or hypothyroid can cause symptoms such as weight gain, fatigue, dry skin, hair loss, intolerance to cold, and constipation.
Conversely an overactive or hyperthyroid can cause sweating, rapid heart rate, anxiety, tremors, fatigue, difficulty sleeping and sudden weight loss.