Thyroid Disorders

All hormones in our body must work in concert to maintain optimal health. Thyroid gland hormones play a major role in regulating this work. In today’s article, we will discuss which symptoms can tell us that not everything is in order with our thyroid hormones. We will also take a closer look at the three ways to check the functioning of the thyroid gland. This article was last reviewed by Svetlana Baloban, Healsens, on January 24, 2020. This article was last modified on 17 February 2020. If we look into history, we will see that thyroidology itself (the study of the thyroid gland) is a relatively new field of endocrinology. In spite of this fact, however, as early as in 1600 BC Chinese writers described the treatment of thyroid goiter (an enlarged thyroid gland) with burnt seaweed. However, the goiter itself was not specifically associated with the thyroid gland. It was only in 1656 that Thomas Wharton first gave the thyroid the name that is still in use today. How thyroid gland hormones affect health Thyroid hormone is the main regulator of hormonal levels. Many people do not realize that they have a dysfunction of the thyroid gland even though it is a disorder, every tenth of which, leads to many adverse health changes. In this case we are talking about already diagnosed problems. However, according to the American Thyroid Association, up to 60 percent of people with thyroid disease go undiagnosed. And an undiagnosed illness can put patients at risk of getting some serious illnesses. How do thyroid hormones affect our body? IN THIS ARTICLE 1 How thyroid gland hormones affect health 2 Thyroid stimulating hormone (TSH) 3 Triiodothyronine (T3) 4 Thyroxine (T4) 5 The role of the pituitary gland RELATED ARTICLES Heart Thyroid gland hormones have a permissive effect on catecholamines. Catecholamines are a group of similar hormones produced by the adrenal medulla. Those, in turn, increase the expression of beta-receptors to increase heart rate, stroke volume, cardiac output, and contractility. Often, people with hypothyroidism have very high cholesterol levels (350 and higher), and a bunch of other risk factors leading to a cardiovascular disease. Thermoregulation Thyroid hormones are responsible for thermoregulation, which is why people with reduced thyroid function (hypothyroidism) often complain that they are constantly cold. This happens due to increased available energy in the body, as well as increased appetite, heart rate, and the amount of oxygen delivered to various parts of the body. Metabolism These hormones also help control the basal metabolic rate (the rate at which calories are burned). So fatigue and excess weight are also signs of hypothyroidism. On average, an underactive thyroid gland can add 5 to 15 kg of weight. But most of that extra weight will come from water and salt. In addition, decreased thyroid function can cause constipation, memory problems, and lethargy. An overactive thyroid gland (hyperthyroidism) is characterized by the opposite signs: having difficulty gaining weight, feeling hot, having frequent bowel movements, feeling nervous, and having a rapid heart rate. Other functions controlled by thyroid hormones include metabolism of fats, proteins and carbohydrates, as well as protein synthesis. Relation to other hormones There is also an interrealtion between thyroid function and control over other hormone levels. So, deviation of the thyroid hormone level from the norm can adversely affect the work of the adrenal glands. For instance, сertain human autoimmune conditions can destroy both the thyroid gland and adrenal cortex resulting in combined hormone deficiencies. Moreover, dysfunction of the thyroid gland negatively affects the levels of sex hormones. Hyper- and hypothyroid men have increased rates of sexual dysfunction, including erectile dysfunction (ED). But the good news is that treatment of thyroid disorder at least partially reverses sexual dysfunction. Thyroid hormone also affects fertility, ovulation, and menstruation. What hormones does the thyroid gland produce? In the following, we will discuss three tests for testing thyroid function – thyroid stimulating hormone (TSH), free T3, and free T4. You will probably want to make these tests part of your early diagnosis program and get them done regularly. Thyroid stimulating hormone (TSH) Thyroid stimulating hormone is a hormone that stimulates the thyroid gland. It is also known as TSH and is a glycoprotein hormone produced by the anterior pituitary gland. It is the main stimulus for the production of thyroid hormones. The TSH screening test is the first line test for suspected thyroid disease. According to the American Thyroid Association, TSH levels are typically between 0.4 and 4.0 milliunits per liter (mU / L). However, these ranges will vary among laboratories and the upper limit can be raised from 4 to 5. If your level is higher than this, you are most likely to have an underactive thyroid gland. However, some studies show that this range should actually lie within 0.45–2.5 mIU / L. This is because TSH below the upper limit of the normal reference range poses an additional risk of progression to overt hypothyroidism over time. So, high TSH levels indicate that your thyroid gland is not producing enough thyroid hormones. This condition is called hypothyroidism, which we wrote about above. Low TSH levels, on the other hand, may mean that your thyroid is producing too much hormone, the condition is called hyperthyroidism. Hyperthyroidism can be caused by Graves’ disease. This is a condition when your body’s immune system attacks the thyroid gland. It can also be a result of too much iodine in your body. T3 (triiodothyronine) and T4 (thyroxine) T3 (triiodothyronine) and T4 (thyroxine) are the two key thyroid hormones that are produced by the thyroid gland. The main product of thyroid secretion is T4, while T3 is secreted only in small amounts. However, the activity of T3 is three to four times higher than that of T4. Nonetheless, both hormones play a vital role. Both T3 and T4 contain iodine. And it is iodine that is one of the main building blocks of both hormones. So let’s talk about tests that help measure the content of these hormones in the body.