Do you sometimes feel tired and lethargic for no reason? Maybe your skin has turned a little pale or yellow. There are times when you can't figure out why this is happening, right? One reason for these symptoms could be your body's own immune system, the soldiers that protect you from diseases, attacking your own red blood cells. That's what we call `Autoimmune Hemolytic Anemia` (AIHA) in medicine. Simply put, your body's defense system mistakes your own red blood cells as an "enemy" and destroys them. Although this is a bit serious, it can be managed well with proper treatment . However, if left untreated, it can be life-threatening. Therefore, it is very important to be aware of this and seek medical advice as soon as possible. Let's talk about this in more detail.
What is `Autoimmune Hemolytic Anemia` (AIHA)?
Simply put, `Autoimmune Hemolytic Anemia` (AIHA) is a condition in which your immune system mistakenly identifies your own red blood cells as "foreign," meaning something harmful to the body. As a result, your body produces antibodies that destroy the red blood cells. These antibodies attach to the red cells and destroy them. What happens then? The number of red blood cells in your body decreases. That's what we call "anemia."
Imagine, what's happening here is like the army that protects our country, mistakenly attacking our own citizens. This is actually a bit complicated, but it's not hard to understand.
What is the difference between primary and secondary AIHA?
There are two main types of AIHA depending on how it occurs.
- Primary AIHA: Sometimes, AIHA can develop without any obvious underlying medical condition. This means that doctors can't figure out why it suddenly appeared. This is called primary AIHA.
- Secondary AIHA: Another type of AIHA is when AIHA is caused by another condition. For example, it can be caused by certain viral infections, autoimmune diseases (in which the body's immune system attacks its own tissues), certain medications, or an underlying blood cancer such as lymphoma.
What are the main types of AIHA?
There are two main types of AIHA. They are ``Warm autoimmune hemolytic anemia`` and ``Cold autoimmune hemolytic anemia`` . These are classified according to the type of antibodies involved in the disease. That is, the name is derived from the temperature at which the antibodies that attack the red blood cells become active.
Warm autoimmune hemolytic anemia
This is the most common type of AIHA. Here, antibodies of the type `IgG` bind to red blood cells. The special thing is that these antibodies are active at our body's normal temperature (i.e., in a "warm" environment). Symptoms usually begin to appear gradually, over a few weeks. However, in some cases, symptoms can become severe even within a few days.
Cold autoimmune hemolytic anemia
This type is seen in only 10% to 20% of AIHA patients. It involves a type of autoantibody called `IgM`. These autoantibodies bind to red blood cells when your blood is at a temperature that is lower than your body's core temperature, which is called ``cold''. This ``cold'' temperature can vary from person to person. This means that for some people, these antibodies may be activated when they are slightly cold, while for others, they may need to be much colder.
Who is most affected by this AIHA condition?
AIHA can develop in anyone, regardless of age or gender. However, the condition is most common in women over the age of 40 .
As common as it is, AIHA is a relatively rare condition . It affects about one or two people in every hundred thousand each year.
What are the symptoms of AIHA?
AIHA can cause a variety of symptoms. Some are very common, while others vary depending on the type of AIHA you have.
Here are some common symptoms:
- Fever
- Extreme fatigue (too tired to do anything well)
- Weakness
- Heart palpitations
- Difficulty breathing (even with a little exertion)
- Pale skin (like when you have low blood pressure)
- Jaundice (yellowing of the skin and eyes)
- Headache (headache)
- Muscle pain
- Dark urine (like tea water)
- Vomiting and nausea
- Shortness of breath
- Diarrhea
- Tongue injury
- Palpitations (feeling your heart beating so much that you can hear it)
Remember, having one or two of these symptoms doesn't mean you have AIHA. But if these symptoms persist, it's best to see a doctor.
Symptoms can vary, especially depending on the type of AIHA:
Warm AIHA is most commonly seen in:
- Fatigue
- Dizziness
- Jaundice (yellowing of the skin)
- Feeling the heartbeat
Cold AIHA may cause symptoms such as:
- Fatigue
- Dizziness
- Cold hands and feet (feeling colder than others)
- Jaundice
- Chest pain
- Pain in the back of the legs
- Raynaud's disease (a condition in which the fingers and toes turn white/blue and numb when exposed to cold)
- Blue discoloration of hands and feet
- Heartbeat irregularities `(Arrhythmia)`
- Hearing a heart murmur
- Heart failure (this is in severe cases)
What are the causes of AIHA?
In about half of all patients with AIHA (about 50%), the exact cause cannot be found . We call this ``idiopathic autoimmune hemolytic anemia.'' That means "no known cause."
In the other half, AIHA is associated with other medical conditions.
Other medical conditions that can cause AIHA include:
There are several autoimmune diseases that can cause secondary AIHA. That is, other diseases in which the body's immune system attacks the body's own healthy cells.
- Lupus : This is a disease that can affect various organ systems, such as the skin, joints, kidneys, and brain.
- Rheumatoid arthritis : A condition that mainly affects the joints, causing pain and swelling.
- Sjogren's syndrome : Dry eyes and mouth are the main symptoms.
- Thyroid disease : Imbalances in thyroid hormones.
- Ulcerative colitis : Inflammation and ulceration of the colon.
- Hashimoto's disease : A condition in which the immune system attacks the thyroid gland.
Sometimes, AIHA can also be caused by a viral infection . However, this anemia often improves once the viral infection is resolved. Some viruses that may be associated with AIHA include:
- Epstein-Barr virus (the virus that causes mononucleosis)
- Measles
- Mumps
- Rubella
- Atypical pneumonia
- Varicella virus, which causes chickenpox
- `HIV`
- Hepatitis (viruses that specifically affect the liver)
- Cytomegalovirus `(Cytomegalovirus)`
Some medications can also cause AIHA. If a medication you are taking is suspected to be causing the condition, your doctor may stop the medication.
- Antibiotics (especially penicillin)
- Nonsteroidal anti-inflammatory drugs (NSAIDs) (e.g. ibuprofen)
- Anti-cancer drugs
How is AIHA diagnosed?
If your doctor suspects that you have symptoms of anemia, he or she will first order a complete blood count (CBC) . This can detect warning signs of anemia. Specifically, this test measures:
- How many red blood cells, white blood cells, and platelets are in your blood.
- The size of your red blood cells (large, small, normal).
- Hemoglobin level - This is the protein in your blood that carries oxygen throughout your body.
- Hematocrit value (how much space your red blood cells take up in your blood).
Other tests that can help diagnose AIHA
If your doctor suspects anemia, he or she will recommend a few more tests. These tests can help determine whether the anemia is caused by AIHA or another cause.
- Peripheral smear: This involves taking a sample of your blood and looking at it under a microscope. This can look for things like whether your red blood cells are damaged or have changed shape.
- Reticulocyte count: This test measures the number of young (newly formed) red blood cells in your body. Remember, when red blood cells are destroyed, the bone marrow starts making more red blood cells to replace them. This increases the reticulocyte count.
- Bilirubin test: When red blood cells are destroyed, a substance called bilirubin is produced. When this increases, jaundice (yellowing of the skin) occurs. So, if the level of bilirubin in the blood is high, it is a sign that red blood cells are being broken down.
- Coombs' test: This is a very important test in diagnosing AIHA. It checks to see if your body is producing antibodies against red blood cells.
- Haptoglobin test: Haptoglobin is a protein that removes waste products from damaged red blood cells. When a lot of red blood cells are destroyed, the body uses up a lot of this haptoglobin. This causes the level of haptoglobin in the blood to decrease.
- Lactate dehydrogenase (LDH): LDH is an enzyme found inside red blood cells. When red blood cells are destroyed, this LDH enzyme is released into the blood. This causes LDH levels to rise.
- Cold agglutinin titer: If your doctor suspects cold AIHA, he or she may order this test. This measures the level of antibodies that attack red blood cells in cold temperatures.
How is AIHA treated?
When treating AIHA, the first step is usually to determine if there is an underlying cause that can be treated. For example, if your AIHA is associated with lupus, your doctor will likely treat the lupus first. If the cause of AIHA is a condition such as lymphoma, it is important to treat that condition. If a medication is causing your AIHA, you may need to stop taking that medication.
However, for some people, AIHA is very mild , meaning the symptoms are not that severe. In such cases, no treatment may be needed.
Medications
- Corticosteroids: These are usually the first-line treatment for AIHA. These medications work by suppressing your body's immune system, which then reduces the amount of damage it does to your red blood cells.
- Immunosuppressants: If corticosteroids alone are not enough to control the disease, your doctor may prescribe these types of medications. These work by stopping the immune system from attacking the bone marrow.
Splenectomy (spleen removal surgery)
If AIHA cannot be controlled with medication alone, you may need to have your spleen surgically removed. The spleen is an organ in our body that filters out abnormal red blood cells, such as red blood cells that have antibodies attached to them. The spleen also contains cells that produce antibodies. So removing the spleen can reduce the destruction of red blood cells and reduce the risk of anemia.
Blood transfusion
In severe cases of AIHA, patients may need a blood transfusion, which is a blood transfusion from outside sources. This can quickly increase the number of red blood cells and help control symptoms.
Is the treatment for 'warm' and 'cold' AIHA different?
Yes, the treatment of primary 'cold AIHA' is different from 'warm AIHA'.
Corticosteroids or immunosuppressive drugs are usually used for 'warm AIHA'. If that is not successful, surgery to remove the spleen may be necessary. In cases of severe anemia, blood transfusions are also considered as supportive therapy while the disease is being treated.
However, 'cold AIHA' does not respond well to corticosteroids or splenectomy. If 'cold AIHA' is mild, the disease can be controlled by keeping the body warm (e.g., using hand/foot warmers, wearing gloves, socks, and possibly traveling to a warmer climate). If treatment is necessary, the drug `Rituximab` (sometimes with other immunosuppressant drugs) is the first-line treatment.
Can the risk of developing AIHA be reduced?
Autoimmune Hemolytic Anemia cannot always be prevented. Sometimes it occurs for no apparent reason. However, if you have a viral infection or are taking a medication known to be associated with AIHA, your doctor can monitor your condition and help reduce your risk of developing the disease.
Is AIHA a serious condition?
Autoimmune Hemolytic Anemia is sometimes so mild that you may not need any treatment. However, sometimes it can be so severe that you may need surgery or a blood transfusion. If you are diagnosed with AIHA, your doctor can talk to you about the severity of your condition and your treatment options.
Most importantly, AIHA can be fatal if left untreated, which is why prompt medical intervention is so important.
Can AIHA be cured?
Yes. Most people with AIHA need little or no treatment. Between 20% and 30% of patients require medication, surgery, or blood transfusions.
When should I see a doctor?
If you start to experience symptoms of anemia – such as extreme fatigue, weakness, jaundice (yellowing of the skin), or difficulty breathing – see a doctor immediately . By getting a diagnosis and treatment early, you can recover faster and return to your normal life.
In summary (Take-Home Message)
Autoimmune Hemolytic Anemia (AIHA) is a condition in which your own immune system attacks your red blood cells, causing anemia.
- Symptoms can be mild or severe. Fatigue, paleness, jaundice, and difficulty breathing are the main ones.
- The causes are varied. Sometimes no cause can be found (primary), sometimes it can be caused by other diseases, infections, or medications (secondary).
- There are several treatment options. These include medications, spleen removal, and blood transfusions. Treatments vary depending on the type of 'warm' and 'cold'.
- Although AIHA is a very manageable disease, it can be serious, even life-threatening , if left untreated.
Therefore, if you have these symptoms, do not panic and do not delay, but seek medical advice. Your doctor can conduct the necessary tests, accurately diagnose your condition, and prescribe the most appropriate treatment. Then you will be able to recover quickly and continue with your daily activities!
` autoimmune hemolytic anemia, AIHA, anemia, red blood cells, antibodies, immune system, jaundice, fatigue
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