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www.reference.com/world-view/symptoms-low-thyroid-615c597884c1bd71

Low levels of thyroid hormone can cause symptoms that include increased cold sensitivity, constipation, brittle hair and nails, fatigue and depression, according to Healthline. Other symptoms include menstrual abnormalities, hoarseness, thickening of the skin, slow speech and a decreased sense of ta

www.reference.com/article/treatment-options-low-thyroid-f180bb789ab7f504

The two main treatment options for low thyroid hormone levels are both meant to replace the missing thyroid hormone, and are the synthetic thyroid hormone thyroxine and natural thyroid hormones, usually derived from pigs, says Mayo Clinic. These natural thyroid hormones include thyroxine and another

www.reference.com/article/low-thyroid-levels-992ea4e7f6b9cc39

Normal thyroid levels range from 0.4 to 4 milli-international units per liter, and anything below this range is considered low, according to MedlinePlus. Low thyroid levels are often caused by an overactive thyroid or certain types of medication, including chemotherapy and opiate-based painkillers.

www.reference.com/article/causes-low-thyroid-levels-7d3a658f26fa7295

The most common cause of low thyroid levels is a condition known as Hashimoto's thyroiditis, which leads to the inflammation of the thyroid gland, according to WebMD. This is an autoimmune disorder in which the body produces antibodies that attack the thyroid. Viral infections can also cause low thy

www.reference.com/article/symptoms-having-low-thyroid-level-37f348e2d43ed1f3

A low thyroid level is commonly referred to as hypothyroidism, with varying symptoms that can include facial puffiness, aching muscles, cold sensitivity and menstrual irregularities, explains Mayo Clinic. Individuals with low levels of thyroid hormone may also experience symptoms such as memory impa

www.reference.com/article/causes-low-thyroid-women-40f47d2f9abc6995

Some causes of low thyroid levels include the autoimmune disorder Hashimoto's thyroiditis, certain medications, radioactive iodine treatment, lack of iodine in the diet, thyroid surgery, and postpartum thyroiditis, notes WebMD. Hypothyroidism is most common in middle-aged and older women, although i

www.reference.com/article/symptoms-low-thyroid-function-43524ded0fcfe874

Symptoms of hypothyroidism or low thyroid hormone production include coarse hair, dry skin, slow body movements, inability to tolerate cold, constipation, and feeling sluggish or weak, explains WebMD. Rarer symptoms include an enlarged thyroid gland, weight gain, swelling in the hands and feet, and

www.reference.com/article/low-thyroid-dogs-mean-86b7cae83f41a7f6

Hyperthyroidism is a condition in which the thyroid is working at below-normal levels. Symptoms of hyperthyroidism in dogs include hair loss, weight gain, intolerance to cold, a slow heart rate, lethargy and chronic constipation.

www.reference.com/world-view/side-effects-low-thyroid-a2dd88985fca11d4

Low thyroid stimulating hormone levels, or TSH, causes symptoms of hypothyroidism, including fatigue, constipation, increased sensitivity to cold, dry skin and a puffy face, according to Mayo Clinic. Other symptoms include hoarseness, elevated blood cholesterol levels, muscle weakness, and stiffness

www.reference.com/world-view/effects-low-thyroid-levels-1359a2280ad8098d

Low thyroid hormone levels, or hypothyroidism, can cause a person's metabolism to slow, according to WebMD. A person's metabolic rate also affects his body temperature, heartbeat and his ability to burn calories.