- Hashimoto's disease.
- thyroiditis, or in?ammation of the thyroid gland.
- Congenital hypothyroidism, or hypothyroidism that is present at birth.
- Surgical removal of part or all of the thyroid gland.
- Radiation treatment of the thyroid.
- Some medications such as heart medications, cancer medications, bipolar disorder medications, and kidney cancer medications.
- Less commonly, hypothyroidism is caused by too much or too little iodine in the diet or by abnormalities of the pituitary gland.
- Soy does not cause hypothyroidism, but it does interfere with the body's ability to absorb thyroid replacement therapy.
- The amounts of broccoli, cabbage, and brussels sprouts that people eat in a normal diet do not cause hypothyroidism.
- There is no evidence that some people's thyroid gland makes enough hormone but it does not get to the body's cells.
- Weight gain.
- Puffy face.
- Cold intolerance.
- Joint and muscle pain.
- Dry, brittle, and thin hair.
- Decreased sweating.
- Heavy or irregular menstrual periods and impaired fertility.
- Depression and anxiety.
- Slowed heart rate.
- About changes in your health that suggest that your body is slowing down.
- If you have ever had thyroid surgery.
- If you have ever had radiation to your neck to treat cancer.
- If you are taking any of the medicines.
- Whether any of your family members have thyroid disease.
- TSH (thyroid-stimulating hormone) test: This is the most important and sensitive test for hypothyroidism. It measures how much of the thyroid hormone T4 (thyroxine) the thyroid gland is being asked to make. An abnormally high TSH means hypothyroidism: the thyroid gland is being asked to make more T4 because there is not enough T4 in the blood. In most labs, the normal range for TSH is 0.4 mU/L to 4.0 mU/L. If your TSH is above 4.0 mU/L on both a first test and a repeat test, you probably may have hypothyroidism.
- T4 tests: Most of the T4 in the blood is attached to a protein called thyroxine-binding globulin. The “bound” T4 cannot get into body cells. Only about 1%-2% of T4 in the blood is unattached (“free”) and can get into cells. The free T4 and the free T4 index are both simple blood tests that measure how much unattached T4 is in the blood and available to get into cells.
- Low body temperature is not a reliable measure of hypothyroidism.
- Saliva tests for thyroid disease are not accurate to confirm hypothyroidism.
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