Do you sometimes feel tired for no reason? Or do you suddenly lose weight or gain weight? Do you ever feel irritable or anxious? You may not know that a small butterfly-shaped gland in the front of your neck can be involved in these things. This small but very important organ in our body is called the thyroid gland. Today, we will talk about this in detail and in a very simple way.
What is this thyroid gland?
Simply put, the thyroid is a small, butterfly-shaped gland located in the front of our neck, on either side of the windpipe. It is part of our body's endocrine system. This system is responsible for producing hormones and controlling various functions in our body.
Imagine that our body is like a big company. Then this endocrine system is the management system that sends messages to the different departments of that company. Those messages are called hormones. The thyroid gland is like a very important manager in this system.
What really happens to the thyroid gland?
The main and most important function of the thyroid gland is to control our body's metabolic rate. "Metabolic rate" may sound like a scientific term, but it's very simple. It means the rate at which the food we eat is converted into energy .
Think of our body as a car. The food we eat is the fuel that fuels that car. The thyroid gland determines how fast this fuel burns.
- If thyroid hormones are high: Gasoline burns faster. That means the metabolic rate is high. The body's energy is used up quickly.
- If thyroid hormones are low: Fuel burns slowly. That means the metabolic rate is low. Energy is used slowly.
To do this job, the thyroid gland mainly produces several types of hormones.
- Thyroxine (T4): This is the hormone produced in the majority by the thyroid gland. However, it does not directly affect metabolism. Once in the bloodstream, this T4 hormone is converted to the more active hormone T3.
- Triiodothyronine (T3): Although it is produced in smaller amounts than T4, it is the T3 hormone that is primarily responsible for controlling metabolic rate.
- Calcitonin: This hormone helps control the level of calcium in our blood.
Most importantly, the thyroid gland needs an element called iodine to make these hormones. We get enough of this iodine from the foods we eat, especially the iodized table salt we use in Sri Lanka.
Does the thyroid gland do this work alone?
Not at all. Our body is a very complex system. The thyroid gland also needs to receive orders from above to do its job properly. These orders come from our brain.
1. Boss - Hypothalamus: This part of the brain is the biggest boss. If it detects that thyroid hormone levels are low, it releases a hormone called TRH.
2. Manager - Pituitary gland: Upon receiving the TRH message from the hypothalamus, the pituitary gland in the brain releases another hormone called TSH (Thyroid-Stimulating Hormone). As the name suggests, this stimulates the thyroid gland.
3. Worker - Thyroid Gland: When TSH is ordered, the thyroid gland produces T4 and T3 hormones and releases them into the blood.
When the thyroid hormone levels in the blood return to normal, these messages simply stop being sent. It's like the motor in your house automatically turning off when the water tank is full. This is how our body keeps hormone levels in balance.
How does a thyroid problem affect the entire body?
As we mentioned earlier, thyroid hormones affect almost every cell in our body. Therefore, if the thyroid gland is underactive, it can affect several systems in our body.
| Body system | How the effect occurs |
|---|---|
| Heart and circulatory system | Affects heart rate (increased or decreased), blood pressure, and cholesterol levels. |
| Nervous system and mind | If hormones are low, depression and memory loss can occur. If hormones are high, anxiety, restlessness, and insomnia can occur. |
| Digestive system | If hormones are insufficient, constipation can occur, and if hormones are excessive, diarrhea can occur. |
| Reproductive system (female) | Irregular menstrual cycles, heavy bleeding, and fertility issues may occur. |
| Skin, hair and nails | Symptoms may include dry skin, hair loss, and brittle nails. |
The main diseases that can occur related to the thyroid gland
Changes in the functioning of the thyroid gland can lead to several major medical conditions. Let's look at these separately.
1. Hypothyroidism – hormone deficiency
In this condition, the thyroid gland does not produce the required amount of hormones. As a result, our body's metabolism slows down and the entire body starts to work "slowly".
Main reasons:
- Hashimoto's disease: This is an autoimmune disease. This means that our body's own immune system mistakenly attacks the thyroid gland.
- Iodine deficiency.
- Surgical removal of the thyroid gland.
- Some medications.
2. Hyperthyroidism – increased hormones
What happens here is that the thyroid gland produces more hormones than necessary. This causes our body's metabolism to increase excessively, and it feels like the whole body starts to "run" at a faster pace.
Main reasons:
- Graves' disease: This is also an autoimmune disease. In this condition, the immune system overstimulates the thyroid gland.
- Nodules in the thyroid gland.
- Thyroiditis.
Here is a table to easily understand the main differences and symptoms of these two conditions.
| Characteristic | Hypothyroidism - hormone deficiency | Hyperthyroidism - increased hormones |
|---|---|---|
| Body weight | Weight gain without reason. | Weight loss despite eating well. |
| Body temperature | Difficulty tolerating the cold. | Difficulty tolerating heat, excessive sweating. |
| Heartbeat | Slow heartbeat. | Rapid heartbeat (feeling like your heart is racing). |
| Mental state | Lethargy, depression, memory loss. | Restlessness, anxiety, irritability. |
| Strength | Extreme fatigue and drowsiness. | Insomnia, hyperactivity. |
| Skin and hair | Dry skin, rough skin, hair loss. | Thinning skin, hair loss. |
3. Goiter – swelling of the gland
This means that the thyroid gland is abnormally enlarged. If you see a lump-like swelling in the front of your neck, it could be a goiter. Not everyone with a goiter will necessarily have abnormal thyroid hormone levels. Sometimes, even though the gland is swollen, hormone levels can be normal. Iodine deficiency is a major cause of goiter.
4. Thyroid Cancer
Compared to other cancers, thyroid cancer is relatively uncommon. In addition, most types of thyroid cancer are highly treatable . Symptoms may not be apparent in the early stages. It is important to seek medical advice if you experience symptoms such as a lump in the neck, a change in voice, or difficulty swallowing.
How do you know if you have a thyroid problem?
If you have one or more of the symptoms mentioned above, the best thing to do is to see your doctor . He or she will examine you and, if necessary, order some tests.
The most important and simplest test is a blood test.
- TSH test: This measures the level of the TSH hormone released by the pituitary gland. If the thyroid gland is not working properly (not producing enough hormones), the TSH level will be high. If the gland is overactive, the TSH level will be low.
- T4 and T3 tests: If necessary, the doctor may also recommend directly measuring the level of thyroid hormones in the blood.
Additionally, if there is a lump or swelling in the gland, a thyroid ultrasound scan may be performed.
What are the treatments?
The good news is that most thyroid conditions can be managed very successfully. Treatment varies depending on the condition.
- For Hypothyroidism: The body's low thyroid hormone is replaced externally. For this, a pill is prescribed to be taken daily. This treatment usually has to be taken for life, but it can help you live a completely normal life.
- For hyperthyroidism: There are treatments such as antithyroid medications, radioactive iodine therapy, or in some cases, surgical removal of the gland (`Thyroidectomy`).
- For thyroid cancer: The main treatment is surgical removal of the gland. This can be followed by radioactive iodine therapy or other treatments as needed.
Even if the thyroid gland is completely removed, you can live a healthy life without any problems by taking a daily hormone pill.
Take-Home Message
- The thyroid is a small, yet very important gland in our neck that controls the body's metabolism.
- Unexplained weight gain, extreme fatigue, mood swings, or changes in heart rate can be symptoms of a thyroid problem.
- If you have any of these symptoms, don't wait and see your doctor immediately . A simple blood test can diagnose the condition.
- Many thyroid conditions can be successfully controlled with medication or other treatments, allowing people to live normal, healthy lives.
- Getting enough iodine through foods such as iodized salt is important for a healthy thyroid gland.
💬 අදහස් (0)
තවමත් කිසිදු අදහසක් පළ කර නොමැත. ඔබේ අදහස පළමු වරට මෙහි එක් කරන්න.
ඔබේ අදහස එක් කරන්න