what does it mean if your thyroid is borderline?
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You're classed as having borderline underactive thyroid if you have a raised thyroid-stimulating hormone (TSH) level, but normal thyroid hormone levels in your blood. Doctors usually call this subclinical hypothyroidism.
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If your TSH levels are abnormally high, it could mean you have an underactive thyroid, or hypothyroidism. That's because it indicates your pituitary gland is producing more TSH in an effort to stimulate your thyroid to produce thyroid hormone, according to the Mayo Clinic.
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This is called hyperthyroidism. Typically, a doctor who is concerned about your thyroid hormone levels will order broad screening tests, such as the T4 or the thyroid-stimulating hormone (TSH) test. If those results come back abnormal, your doctor will order further tests to pinpoint the reason for the problem.
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Low TSH levels indicate hyperthyroidism. This is also known as an overactive thyroid. If the thyroid gland is secreting levels of hormones that are too high, the pituitary gland produces less TSH.
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TSH > 4.0/mU/L with a low T4 level indicates hypothyroidism. If your TSH is > 4.0 mU/L and your T4 level is normal, this may prompt your physician to test your serum anti-thyroid peroxidase (anti-TPO) antibodies.
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A TSH test is done to find out if your thyroid gland is working the way it should. It can tell you if it's overactive (hyperthyroidism) or underactive (hypothyroidism). The test can also detect a thyroid disorder before you have any symptoms. If untreated, a thyroid disorder can cause health problems.
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Symptoms may include unintentional weight gain or loss, persistent fatigue, palpitations, and sensitivity to hot or cold temperatures. But because other health problems cause similar symptoms, diagnosing hypothyroidism or hyperthyroidism based on symptoms alone is not possible.
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TSH triggers the thyroid, a butterfly-shaped gland at the front of the neck, to make the hormones T3 and T4. Subclinical hypothyroidism occurs when TSH levels are slightly elevated but T3 and T4 are normal. Subclinical hypothyroidism and full-blown hypothyroidism share the same causes.
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An underactive thyroid gland (hypothyroidism) is where your thyroid gland does not produce enough hormones. Common signs of an underactive thyroid are tiredness, weight gain and feeling depressed.
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People with hypothyroidism produce too little thyroid hormone, and overtime that deficiency can damage the nerves that send signals from your brain and spine to your arms and legs. Some people with underactive thyroids will feel tingling or numbness in their muscles, while others might experience leg cramps.
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The test, called a thyroid function test, looks at levels of thyroid-stimulating hormone (TSH) and thyroxine (T4) in the blood. Doctors may refer to this as "free" T4 (FT4). A high level of TSH and a low level of T4 in the blood could mean you have an underactive thyroid.
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Hypothyroidism, or low thyroid, is a common disorder. It can cause a variety of symptoms, such as fatigue, weight gain and feeling cold. It can also result in problems with your hair, skin, muscles, memory or mood.
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The Bottom Line Hypothyroidism, or low thyroid, is a common disorder. It can cause a variety of symptoms, such as fatigue, weight gain and feeling cold. It can also result in problems with your hair, skin, muscles, memory or mood. Importantly, none of these problems are unique to hypothyroidism.
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These include: Graves' disease – a condition where your immune system mistakenly attacks and damages the thyroid (about 3 in every 4 people with an overactive thyroid have Graves' disease) lumps (nodules) on the thyroid – this extra thyroid tissue can produce thyroid hormones, causing your levels to be too high.
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How Synthroid works. When you have hypothyroidism, your thyroid isn't able to make enough thyroid hormone (thyroxine). As a result, your body's system slows down. Synthroid is a prescription medicine that helps restore thyroid levels by replacing the amount of thyroxine that your body is missing.
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In rare cases, an undiagnosed or poorly controlled overactive thyroid can lead to a serious, life-threatening condition called a thyroid storm. This is a sudden flare-up of symptoms that can be triggered by: an infection.
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A healthy thyroid plays a vital part in brain chemistry, so we should not be surprised that a thyroid disorder can cause unpredictable mood changes. For example those with an overactive thyroid (hyperthyroidism) can suddenly feel tense and anxious.