Have you ever heard of a gland called the "Thymus"? Probably not. It is a very small, but indispensable organ that works like a hero to our body's defense system, especially when we are young. This thymus works like a 'military training school' that trains the soldiers in our body. So today, let's talk about this little hero hidden in our body, in simple terms.
Simply put, what is this thymus?
The thymus is a small gland that is part of our lymphatic system . Now you might be wondering what this lymphatic system is. It's very simple. Think of our body as a big city. This city needs a defense system to protect it from enemies called diseases and germs. The lymphatic system is a major part of that defense system. Organs like your tonsils, spleen, and appendix are all part of this system.
So, in this whole defense network, our immune system , the thymus plays a very important role. It helps us fight germs.
What really happens during menstruation?
The main and most important function of the thymus is to train a special type of white blood cell in our body. We call these white blood cells T-lymphocytes or T-cells .
Think of it this way. Our bone marrow factory produces a new group of untrained 'soldiers' (lymphocytes). But these people can't go straight to fighting disease. They need special training. The thymus is the 'military training school' that provides that training.
These untrained lymphocytes travel through the blood to the thymus, where they become skilled, specialized T-cells and then graduate. These trained T-cells then travel to our lymph nodes and other organs in the lymphatic system, ready for any fight. When a germ enters our body, these T-cells are the ones who go to the front and fight and protect us.
Not only that, the thymus also functions as part of our endocrine system . That is, it is part of the system that produces hormones necessary for the body to function. Here are some of the hormones produced by the thymus:
- Thymopoietin: This stimulates the production of T-cells and signals the pituitary gland in our brain to release other hormones.
- Thymosin and thymulin: These help create specific types of T-cells.
- Thymic humoral factor: This hormone helps keep our immune system functioning properly.
At what age is the thymus most active?
This is the most amazing thing. The thymus is most active during childhood . In fact, before you're even born, while you're still in your mother's womb, your thymus starts making T-cells. It continues to make T-cells throughout childhood.
By the time you reach puberty , your thymus has produced most of the T-cells you will need for the rest of your life. Just as a large army is trained and deployed to defend the country, and the head of the training school retires, the thymus gradually begins to shrink after puberty. The space that has shrunk does not empty, but instead is filled with fat. This is completely normal.
Where is this thymus? How can I see it?
The thymus is located in the upper part of our chest, directly behind the breastbone (sternum) . To be precise, it is located midway between the two lungs, slightly above and in front of the heart.
It is a light pinkish-gray gland. It is made up of two irregularly shaped lobes. The thymus is relatively large for its size in infants and children. It reaches its maximum weight, about 28 grams (1 ounce), during puberty. It then gradually shrinks as we age.
What diseases can affect the thymus?
Usually, we rarely have problems with the thymus in our daily lives. However, some rare diseases and problems can occur. There are various conditions ranging from genetic diseases that are present at birth to cancers that occur in adulthood. Let's understand it simply from the table below.
| Condition | Simply put... |
|---|---|
| DiGeorge syndrome | This is a congenital condition. In this case, the child's thymus is either not present at birth, or is very small and underdeveloped. As a result, the child's immunity is very weak, and he is at high risk of frequent and severe infections. |
| Graft-versus-host disease | If a child with DiGeorge syndrome is transplanted with a thymus from a deceased baby, the child's immunity can be restored to some extent. But sometimes, the cells from the newly transplanted thymus begin to attack the child's own cells. That's why it's called this. |
| Mediastinal masses | The middle part of the chest where the thymus is located is called the mediastinum. Any lump, fluid-filled sac (cyst), or abnormality that develops in this area is called this name. These may or may not be cancerous. |
| Thymoma and thymic carcinoma - Thymus cancer | These are two rare types of cancer that start in the cells lining the thymus. Thymoma is like normal thymus cells, grows slowly, and is less likely to spread to other parts of the body. Thymic carcinoma is not like normal cells, grows quickly, and is more likely to spread to other parts of the body. |
Other diseases related to thymus cancer
Sometimes, other medical conditions that are not directly related to a thymus tumor can occur.
- Myasthenia gravis: This is an autoimmune disease. In this condition, our immune system makes antibodies that block signals from our nerves to our muscles. This causes severe muscle weakness.
- Pure red cell aplasia: In this condition, the body is unable to make new red blood cells, causing severe anemia.
- Hypogammaglobulinemia: Very low levels of antibodies in the body, which reduces the body's ability to resist disease.
The important thing is that many of these diseases are very rare. So don't be unnecessarily scared by reading about them. It's important to be aware.
What are the symptoms of thymus cancer?
There are several common symptoms of thymus cancer. If you have one or more of these symptoms for a long time, it is wise to see a doctor.
- Pain in the upper chest (pain in the area where the thymus is)
- A persistent cough that cannot be stopped
- Difficulty breathing
- Hoarseness of voice
- Swelling of the face, neck, upper chest, or arms
These symptoms can also be symptoms of many other common diseases. So don't panic and think it's cancer. But don't ignore these symptoms either. The best thing to do is to see your family doctor and talk about it.
Can we live without the thymus?
This is a good question. As we discussed earlier, the thymus' main function is during childhood and adolescence. By the time an adult is born, they have produced enough T-cells for life. Therefore, an adult can live without a thymus. If, for some reason, an adult's thymus needs to be surgically removed, it will not cause any major health problems.
However, if the thymus gland of an infant or young child has to be removed, it can cause serious health problems. Because their immune system is not yet fully developed, such a child may be more likely to get infections, develop autoimmune diseases, develop allergies, and have an increased risk of cancer.
Are the thymus and thyroid two different things?
Yes! Many people get confused because these two names are a bit similar. But the thymus and the thyroid are two completely different glands. Their location, function, everything is different.
| Feature | Thymus | Thyroid gland |
|---|---|---|
| Location | In the upper part of the chest, behind the breastbone. | In the front of the neck, below the larynx (voice box). |
| Owned system | Mainly the Immune System and the Lymphatic System. | Mainly the Endocrine System. |
| Main function | Training and maturation of T-cells (immune cells). | Production of hormones that control the body's growth and metabolism. |
You see, right? These are two completely different stories.
Take-Home Message
- The thymus is a very important part of our immune system. It's like a training school that trains our body's defense soldiers, called T-cells.
- This gland is most active during childhood. It is normal for it to gradually shrink after puberty.
- Thymus-related diseases are very rare, but if you have symptoms like chest pain, persistent cough, or difficulty breathing, don't panic and seek medical advice.
- The thymus and thyroid are not the same thing. Their locations and functions are completely different.
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