what are the dangers of low tsh?
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High or low levels of thyroid-stimulating hormone may increase total morality risk in adults, and low TSH may specifically increase the risks for incident cardiovascular disease, coronary heart disease and stroke, study data show.
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If you have an untreated (or undertreated) underactive thyroid gland (hypothyroidism) you are likely to find it more difficult to conceive. You may have longer or heavier periods, which can cause anaemia, or your periods may stop completely.
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Extremely low levels of thyroid hormone can cause a life-threatening condition called myxedema. Myxedema is the most severe form of hypothyroidism. A person with myxedema can lose consciousness or go into a coma. The condition can also cause the body temperature to drop very low, which can cause death.
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TSH is made in a gland in the brain called the pituitary. When thyroid levels in your body are low, the pituitary gland makes more TSH. When thyroid levels are high, the pituitary gland makes less TSH. TSH levels that are too high or too low can indicate your thyroid isn't working correctly.
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In addition, hypothyroidism can cause mild high blood pressure and raise blood levels of cholesterol. Respiratory system — Hypothyroidism weakens the respiratory muscles and decreases lung function. Symptoms can include fatigue, shortness of breath with exercise, and decreased ability to exercise.
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['faintness.', 'dizziness.', 'blood pressure drop.', 'slowing heart rate.', 'hypotension.', 'weakness.', 'dehydration.', 'thyroid malfunction.']
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If left untreated, hyperthyroidism can cause serious problems with the heart, bones, muscles, menstrual cycle, and fertility. During pregnancy, untreated hyperthyroidism can lead to health problems for the mother and baby. The thyroid is a small gland in your neck that makes thyroid hormones.
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In addition, it is impossible to avoid having too much thyroid hormone in the system soon after each dose of T3 is taken. High T3 levels can lead to unpleasant symptoms such as rapid heart beat, insomnia and anxiety. High T3 levels also can harm the heart and the bones.
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If the levels of thyroid hormone drop, the pituitary gland makes more TSH to stimulate the thyroid gland to work harder and make more thyroid hormone. Accordingly, an increased level of TSH strongly suggests the presence of hypothyroidism.
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Conversely, hypothyroidism occurs when the thyroid gland is underactive and does not produce enough hormones. Hypothyroidism can weaken the heart muscle and heart rate, reducing the heart's pumping capacity and increase the stiffening of blood-vessel walls. The combination of these changes can lead to hypertension.
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People with hypothyroidism may also have a slower heart rate, or bradycardia. Low thyroid levels can affect the heart in other ways too. These effects may include: changes in blood pressure.
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In People Without Known Thyroid Disease While often associated with hyperthyroidism, a low TSH could also be a sign of central hypothyroidism. Central hypothyroidism: Less commonly, a lack of TSH produced by the pituitary gland (due to its dysfunction) can lead to low thyroid levels in the blood.
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Some people treated for hypothyroidism may still experience symptoms even if blood tests show that their thyroid stimulating hormone (TSH) levels are well within the normal range.
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High TSH levels can mean your thyroid is not making enough thyroid hormones, a condition called hypothyroidism. Low TSH levels can mean your thyroid is making too much of the hormones, a condition called hyperthyroidism. A TSH test does not explain why TSH levels are too high or too low.
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Hyperthyroidism (too much thyroid hormone) may cause palpitations, shortness of breath, and lightheadedness. Hypothyroidism (too little thyroid hormone) may cause low blood pressure and a decreased heart rate leading to lightheadedness, weakness, lethargy, and chills.
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Low TSH levels indicate hyperthyroidism. 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.