Thyroid Disorders: Symptoms, Tests and Daily Care
Underactive vs. overactive thyroid
Hypothyroidism means too little thyroid hormone; hyperthyroidism means too much. Hashimoto's disease, an autoimmune condition, is the most common cause of hypothyroidism, while Graves' disease is the most common cause of hyperthyroidism.
How it's diagnosed
Mayo Clinic notes that symptoms alone can't reliably distinguish hypo- from hyperthyroidism, so blood testing is needed. A high TSH level usually points to hypothyroidism, while a low TSH usually points to hyperthyroidism.
Treatment and follow-up
Hypothyroidism is commonly treated with levothyroxine; hyperthyroidism is often managed with medications such as methimazole. Either condition typically requires periodic blood testing to keep dosing accurate over time.
Key takeaways
- Thyroid disorders split into underactive (hypothyroidism) and overactive (hyperthyroidism), each with different common causes.
- Blood testing (TSH and related markers), not symptoms alone, is needed for diagnosis.
- Treatment usually requires ongoing monitoring to keep medication dosing accurate.
When to see a doctor
- Unexplained fatigue, weight change, heart rate changes, or temperature sensitivity.
- Known thyroid disease with new or worsening symptoms despite treatment.
Related articles
This article is for general educational purposes only and is not medical advice. It does not replace diagnosis, treatment, or personalized recommendations from a licensed healthcare professional. Hands On Health is an independent blog and is not affiliated with any clinic.