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    Thyroid Disorders - Hyperthyroidism

    Where To Seek Treatment
    Singapore General Hospital
    Contributed by Dept of Endocrinology


    The thyroid is a butterfly-shaped gland situated in the front of the neck. Its main function is to produce two hormones - thyroxine and triiodothyronine - which are crucial to the control of various bodily functions.

    Should the thyroid malfunction, it can cause health problems that can affect your quality of life. Women are more susceptible than men to thyroid disorders. Thyroid hormone (TH) imbalances are usually related to autoimmune disorders - when healthy cells and tissues in your body are mistakenly attacked by your own immune system. It is not known why this happens, but there appears to be a genetic link.

    Too little, too much?

    When an underactive gland doesn't produce enough thyroid hormones to adequately meet the body's needs, the condition is referred to as hypothyroidism. Conversely, in hyperthyroidism; an overactive thyroid gland results in the excessive production of thyroid hormones.
    Hypothyroidism and hyperthyroidism are the two most common thyroid disorders in women between the age of 20 and 50, who are also five times more likely than men to develop thyroid disorders.


    In 70% of the cases, hyperthyroidism results from an autoimmune disorder known as Graves' disease, a condition in which the body's own antibodies attack the thyroid. This causes it to produce too much of the hormone thyroxine, which speeds up the body's metabolism in turn.


    Signs and symptoms of an overactive thyroid include:

    • Sudden, unexplained weight loss
    • Increased sensitivity to heat
    • Increased heart rate
    • Nervousness, anxiety and irritability
    • Hand tremors
    • Changes in menstrual patterns
    • Diarrhoea
    • Bulging eyes
    • Enlarged thyroid gland (goiter) that can appear as a swelling at the base of the neck
    • Fatigue, muscle weakness
    • Restlessness and insomnia


    Hyperthyroidism can lead to a number of complications such as:

    • Irregular heartbeat. This can worsen heart problems such as angina.
    • Brittle bones (osteoporosis). Excessive thyroid hormones can affect your body's absorption of calcium into the bones.
    • Eye problems. Grave's disease can cause protrusion of the eyes as well as sensitivity to light and blurring or double vision.
    • Thyrotoxic crisis. The sudden intensification of hyperthyroidism symptoms, leading to fever, rapid pulse and even delirium.


    Treatment options for hyperthyroidism depend on your age, physical condition, and the cause and severity of your condition. These include:

    Anti-thyroid medicine
    These drugs gradually reduce the symptoms of hyperthyroidism by blocking the production of thyroid hormones. Symptoms usually improve within 6-12 weeks of taking the medication, and this may last for at least a year or longer.

    Radioactive iodine treatment
    For those who don't respond to anti-thyroid medications, radioactive iodine is taken orally and absorbed
    by the thyroid. Symptoms usually subside within three to six months. This treatment causes thyroid activity to slow considerably and possibly permanently (hypothyroidism), and you may have to take thyroid supplements.

    Surgery (thyroidectomy)
    Removing your thyroid gland as a last resort. Risks include damage to your vocal cords and parathyroid glands - the four tiny glands located on the back of your thyroid gland that help to control the level of calcium in your blood. You may need life-long treatment with medication to keep your thyroid hormone level normal post-surgery. If the parathyroid glands are also removed, you'll need medication to keep your blood-calcium levels normal.

    Need indepth information ?

    Access our Conditions & Treatments sections for related topics on Hypothyroid and Thyroid Disorders.

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