What Is Hypothyroidism Causes Symptoms Diagnosis and Treatment
What is Hypothyroidism?
The human body is made up of many organs, glands, nerves, and tissues that perform to keep our body in a healthy condition. The thyroid glands is a ductless endocrine gland that secretes hormones directly into the blood. Two types of hormones are produced by thyroid gland - Thyroxine T4 AND Triiodothyronine T3. Together, these two hormones are known as thyroid hormones. Any abnormalities in the thyroid glands and its hormones lead to health issues. These hormones help to burn calories and regulate the heart rate. Here, we will study about hypothyroidism hormone. In addition, we shall also learn about the precautions for hypothyroidism, if one faces health conditions.
You know by now that the thyroid is a butterfly-shaped endocrine gland (secreting hormones directly into the blood) in your neck. It makes and secretes two hormones directly into the blood- thyroxine (T4) and triiodothyronine (T3). These hormones are essential for all cells in the body to function normally. The thyroid gland also secretes a protein hormone called thyrocalcitonin or TCT. This hormone is responsible for regulating calcium levels in the blood. It is essential to have a balanced metabolism in the body to keep it fit and healthy. Fig.1
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Sometimes, there may be an imbalance in the metabolism. Note that to have a balanced metabolism, a balanced secretion of thyroid hormone is vital. The balance in the flow of thyroid hormones sometimes sees an impairment. This impairment can lead to overproduction or underproduction of hormones. When the thyroid produces more hormones, it leads to hyperthyroidism. When there is less production or underproduction, the condition is known as hypothyroidism.
Hypothyroidism
Hypothyroidism is a condition when the thyroid gland does not produce enough thyroid hormones to meet the needs of the body. In other words, we can say that the thyroid gland becomes underactive. The opposite of hypothyroidism is hyperthyroidism- a situation where the thyroid gland is overactive. It is important to note that there is a link between hyperthyroidism and hypothyroidism and it is complex- one can lead to the other, in some circumstances.
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Causes of Hypothyroidism
Thyroid hormones regulate the rate of metabolism in our body. Or, we can say that it shows the way how our body uses energy. If the production of thyroxine levels are low in the body, many of the functions in the body slow down. Let us know about some causes that lead the thyroid gland to under-produce the all-too vital thyroxine hormone. Some of the common causes of hypothyroidism are:
Some types of medications.
Severe deficiency in Iodine
Hashimoto’s thyroiditis
Any disorders in the pituitary gland.
Exposure of neck area to radiations.
Removal or damage to the thyroid gland by surgery.
Symptoms of Hypothyroidism
The symptoms in case of hypothyroidism may depend upon the severity. In most cases, the symptoms may differ from person to person. The signs and the symptoms also depend upon the level of the hormonal deficiency. When the thyroid gland is underactive or produces less hormone, the situation can slow down other activities of the body. It is difficult to initially realise the condition of hypothyroidism. With time, as the metabolism or the use of energy slows down, prominent signs and symptoms emerge. Here are a few symptoms of hypothyroidism to look out for:
1 – Fatigue or tiredness
2 – High cholesterol along with weight gain.
3 – Problems with memory.
4 – A dull, pale, and coarse skin.
5 – Dry hair and hair loss.
6 – Frequent constipation issues
7 – Abnormal menstrual cycles
8 – Depression and irritability
9 – Excess sleep and lack of energy.
10 – Muscle cramps
Treatment for Hypothyroidism
There is no permanent cure for this condition. However, medications and lifelong therapies work. Specific drugs work and are useful in controlling the imbalance by replacing the levels of T4 and T3 hormones. Some thyroid supplements are available to treat this underproduction. The doctors typically check the age, causes, and hormone levels before they can prescribe any medications.
Along with the treatment, it is essential to follow some precautions and adopt lifestyle changes to address the issue. Regular testing also helps. Some changes and measures include having a balanced diet, regular exercise, walking, and weight loss programs. Plus, quitting smoking habits and cutting down on consumption of alcohol, and drinking lots of water.
FAQs on Hypothyroidism and Thyroid Hormone Deficiency Explained
1. What is hypothyroidism?
Hypothyroidism is a condition in which the thyroid gland produces insufficient amounts of thyroid hormones, mainly thyroxine (T4) and triiodothyronine (T3). These hormones regulate the body’s metabolism, energy production, and growth. When hormone levels are low, body processes slow down, leading to fatigue, weight gain, and cold intolerance.
2. What causes hypothyroidism?
Hypothyroidism is most commonly caused by autoimmune damage to the thyroid gland, especially Hashimoto’s thyroiditis. Other causes include:
- Iodine deficiency in the diet
- Thyroid surgery or radioactive iodine therapy
- Certain medications (e.g., lithium)
- Congenital absence or underdevelopment of the thyroid gland
3. What are the common symptoms of hypothyroidism?
Common symptoms of hypothyroidism include fatigue, weight gain, and sensitivity to cold due to a slowed metabolic rate. Other frequent signs are:
- Dry skin and hair loss
- Constipation
- Bradycardia (slow heart rate)
- Depression or memory problems
- Menstrual irregularities in females
4. How does hypothyroidism affect metabolism?
Hypothyroidism lowers metabolism by reducing the levels of T3 and T4, which normally stimulate cellular energy production. As a result:
- Basal metabolic rate decreases
- Heat production declines
- Energy generation in mitochondria slows
5. What is the difference between hypothyroidism and hyperthyroidism?
The main difference is that hypothyroidism involves low thyroid hormone levels, while hyperthyroidism involves excessive thyroid hormone production. In hypothyroidism:
- Metabolism slows down
- Weight gain is common
- Heart rate decreases
- Metabolism speeds up
- Weight loss occurs
- Heart rate increases
6. How is hypothyroidism diagnosed?
Hypothyroidism is diagnosed primarily through blood tests measuring thyroid-stimulating hormone (TSH) and T4 levels. Typical findings include:
- Elevated TSH (due to feedback from the pituitary gland)
- Low free T4 levels
7. What is Hashimoto’s thyroiditis?
Hashimoto’s thyroiditis is an autoimmune disorder in which the immune system attacks the thyroid gland, leading to chronic inflammation and hypothyroidism. It involves:
- Production of anti-thyroid antibodies (e.g., anti-TPO)
- Gradual destruction of thyroid tissue
- Reduced synthesis of T3 and T4
8. Can hypothyroidism affect growth and development?
Yes, hypothyroidism can impair growth and brain development, especially in infants and children. In severe congenital cases:
- It causes cretinism, marked by stunted growth and intellectual disability
- Delayed skeletal maturation occurs
9. What is subclinical hypothyroidism?
Subclinical hypothyroidism is a mild form of thyroid dysfunction where TSH is elevated but T4 levels remain normal. Individuals may:
- Have no obvious symptoms
- Experience mild fatigue or weight gain
10. How is hypothyroidism treated?
Hypothyroidism is treated with daily replacement of synthetic levothyroxine (T4) to restore normal thyroid hormone levels. Treatment involves:
- Oral hormone tablets taken regularly
- Periodic monitoring of TSH levels
- Dose adjustment based on blood test results
