What is hyperthyroidism?Your thyroid is an endocrine gland that secretes hormones into your bloodstream. It provides a vital function by regulating your metabolism. Show
Hyperthyroidism is a health condition that occurs when your thyroid gland becomes overactive and produces more thyroid hormones than you need. When you have hyperthyroidism your metabolism speeds up, making your body work harder and faster. It is a common condition affecting more women than men. Terms explainedAutoimmune disorder – a condition where your own antibodies attack your body. Causes of hyperthyroidismThere are several causes of hyperthyroidism, including:
Graves’ diseaseThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder which is caused when your own immune system antibodies start to attack your body. Your pituitary gland regulates the production of hormones by releasing a Thyroid Stimulating Hormone (TSH) chemical. In Graves’ disease, your own antibodies imitate the activity of the TSH and cause your thyroid to produce too much hormone. Graves’ disease is more commonly found in women between 20 and 40. You are more susceptible to the condition if you have family members affected by it. In addition to hyperthyroidism symptoms, Graves’s disease symptoms include:
Signs and symptoms of hyperthyroidismHyperthyroidism presents a range of symptoms with most relating to the speed of your metabolism and include:
Diagnosis of hyperthyroidismHyperthyroidism can be diagnosed by your doctor by testing your blood to determine your hormone levels. In some cases your blood will also be tested for certain antibodies. If your blood tests confirm you have hyperthyroidism, your doctor will refer you to an endocrinologist (hormone conditions specialist). Your endocrinologist may perform further tests including scans. Radioisotope scanThis test involves injecting a small volume of radioactive substance – iodine or sodium pertechnetate – into your blood. The test is safe and the level of radioactive substance is low. Your neck is then scanned to detect overactive areas of your thyroid. Ultrasound scanAn ultrasound is taken to measure the size and determine the exact location of a goitre. Treatment of hyperthyroidismThere is no cure for hyperthyroidism although the condition is manageable. Treatment seeks to reduce the thyroid hormones to a normal level (a status called euthyroid) to regulate your metabolism. MedicationDepending on your specific condition, your doctor or endocrinologist may prescribe:
There is also the risk that your medication could lead to hypothyroidism (underactive thyroid), so you will need to have regular blood tests to ensure you are taking the correct dose. Non-surgical proceduresRadioiodine treatmentRadioiodine is an iodine that has been made radioactive and is used to treat some thyroid conditions including thyroid cancer and most types of hyperthyroidism. It involves taking a radioiodine capsule or drink, which is absorbed by your thyroid and as the radioactivity increases it destroys some of your thyroid tissue. It’s important that the dosage is accurate as the treatment could cause hypothyroidism if it is too high and you may require thyroxine replacement. Radioiodine is not suitable if you're pregnant or breastfeeding. SurgerySurgical options include a thyroidectomy, an operation that involves the surgical removal of all or part of the thyroid gland. A thyroidectomy is usually recommended by your doctor if:
As with all surgery there are some risks associated with this procedure that you should discuss with your doctor. Treatment for thyroid eye diseaseIf you have Graves’ disease you may also need treatment for eye disease, which is an associated health condition. Temporary solutions include:
For severe symptoms long term treatments include:
Hypothyroidism - underactive thyroidThyroid conditions can easily be misdiagnosed as symptoms are similar to a range of other health conditions. If you have an overactive thyroid it’s important that you have your thyroid stimulating hormone (TSH), T4 and T3 hormone levels checked regularly. When people are treated for hyperthyroidism they sometimes develop hypothyroidism – an underactive thyroid. This is because the medication causes the thyroid to go from overactive to underactive if the correct dose is not taken. The difference between an underactive and an overactive thyroid is:
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Acknowledgements Diabetes and Endocrine Health Network This publication is provided for education and information purposes only. It is not a substitute for professional medical care. Information about a therapy, service, product or treatment does not imply endorsement and is not intended to replace advice from your healthcare professional. Readers should note that over time currency and completeness of the information may change. All users should seek advice from a qualified healthcare professional for a diagnosis and answers to their medical questions. See also
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