This is general health information only and is not a substitute for advice from your GP or healthcare professional.
1. What is the key difference between Hashimoto thyroiditis and Graves’ disease?
Hashimoto thyroiditis and Graves’ disease are both autoimmune thyroid conditions, but they have opposite effects. Hashimoto thyroiditis typically leads to an underactive thyroid (hypothyroidism), while Graves’ disease causes an overactive thyroid (hyperthyroidism).
2. What causes these conditions?
Both conditions occur when the immune system mistakenly targets the thyroid gland. In Hashimoto thyroiditis, immune attack gradually damages the thyroid, reducing hormone production. In Graves’ disease, antibodies stimulate the thyroid to produce excessive hormones.
3. What are the symptoms of Hashimoto thyroiditis?
Symptoms are related to low thyroid hormone levels and may include fatigue, weight gain, cold intolerance, dry skin, constipation, depression, and slowed heart rate. Symptoms often develop gradually over time.
4. What are the symptoms of Graves’ disease?
Graves’ disease causes symptoms of excess thyroid hormone, including weight loss, heat intolerance, sweating, palpitations, anxiety, tremors, and increased bowel movements. Some patients also develop eye changes such as bulging eyes.
5. How do the conditions affect the thyroid gland itself?
In Hashimoto thyroiditis, the thyroid may become enlarged (goitre) and gradually lose function over time. In Graves’ disease, the thyroid is often diffusely enlarged and overactive, producing excessive hormones.
6. How are these conditions diagnosed?
Diagnosis involves blood tests measuring thyroid hormone levels and thyroid-stimulating hormone (TSH). Specific antibodies help differentiate the conditions, such as anti-thyroid peroxidase antibodies in Hashimoto thyroiditis and TSH receptor antibodies in Graves’ disease.
7. How is Hashimoto thyroiditis treated?
Treatment focuses on replacing deficient thyroid hormone using levothyroxine. The dose is adjusted based on regular blood tests to maintain normal hormone levels.
8. How is Graves’ disease treated?
Treatment options include antithyroid medications to reduce hormone production, radioactive iodine therapy to shrink the thyroid, or surgery in selected cases. Beta-blockers may be used to control symptoms such as palpitations.
9. Can one condition turn into the other?
In rare cases, autoimmune thyroid disease can shift from one form to another over time due to changes in the immune response, but this is uncommon.
10. When should I see a doctor?
You should seek medical advice if you experience symptoms of thyroid imbalance such as unexplained weight changes, fatigue, palpitations, or temperature intolerance. Early diagnosis and treatment help prevent complications and improve quality of life.