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  1. Hyperthyroidism - Symptoms and causes - Mayo Clinic

    Nov 30, 2022 · Understand what happens when your thyroid is overactive and learn about treatment for this condition.

  2. Hyperthyroidism (Overactive Thyroid): Symptoms & Treatment

    Hyperthyroidism, also called overactive thyroid, happens when your thyroid makes and releases high levels of thyroid hormone. It speeds up several bodily functions, causing symptoms like rapid heart …

  3. Common Symptoms That Indicate an Overactive Thyroid

    Nov 2, 2025 · An overactive thyroid occurs when your thyroid gland produces too much hormone, causing symptoms like a quickened heartbeat, anxiety, and weight loss. Recognizing these signs …

  4. Hyperthyroidism (Overactive Thyroid) - NIDDK

    Hyperthyroidism, an overactive thyroid gland, can speed up your body’s functions. Learn about its causes, complications, symptoms, diagnosis, and treatment.

  5. Overactive thyroid (hyperthyroidism) - NHS

    Find out about overactive thyroid (hyperthyroidism), including what the symptoms are, when to see a GP, how it's treated and why it happens.

  6. Hyperthyroidism: Symptoms, Causes, Diagnosis, Treatment

    Apr 11, 2024 · If you have hyperthyroidism, it means your thyroid is overactive and produces too much of a hormone called thyroxine. Learn symptoms, causes, diagnosis, and treatment options.

  7. Hyperthyroidism: Symptoms, Causes, Treatment, and More

    Jul 8, 2025 · What Is Hyperthyroidism (Overactive Thyroid)? Hyperthyroidism occurs when the thyroid gland produces too much thyroid hormone, leading to symptoms like weight loss, rapid heartbeat, …

  8. Hyperthyroidism | American Thyroid Association

    Apr 21, 2021 · Hyperthyroidism means that your thyroid gland is making too much thyroid hormone. You may also hear the term thyrotoxicosis. This also means there is too much thyroid hormone in your body.

  9. Hyperthyroidism - Harvard Health

    Apr 11, 2025 · Hyperthyroidism is a condition in which your body makes too much thyroid hormone. It is also called overactive thyroid. Thyroid hormones are made by the thyroid gland. The thyroid gland is …

  10. Hyperthyroidism – Symptoms and Causes | Penn Medicine

    When your thyroid is overactive, you may experience weight loss, changes in your heart rate, nervousness, and other symptoms. Over time, hyperthyroidism causes heart problems and other …