What is Castleman Disease? Symptoms, Causes, & Treatment

Castleman disease is a rare condition that affects your lymph nodes and immune system. It causes lymph nodes to grow larger than normal and can make you feel quite unwell with symptoms like fatigue, fever, and weight loss.

This condition isn't cancer, but it does involve abnormal growth of cells in your lymphatic system. Your lymph nodes, which normally help fight infection, become enlarged and overactive. While Castleman disease is uncommon, understanding it can help you recognize symptoms and seek appropriate care if needed.

What are the types of Castleman disease?

Castleman disease comes in two main forms, and knowing the difference helps doctors choose the right treatment approach. The type you have affects how the condition behaves and what symptoms you might experience.

Unicentric Castleman disease affects only one group of lymph nodes in a single area of your body. This form is typically less severe and often doesn't cause symptoms throughout your whole body. Many people with this type feel relatively well and may only notice a lump or swelling in one area.

Multicentric Castleman disease involves multiple lymph node groups throughout your body. This form tends to cause more widespread symptoms and can make you feel quite sick. It's more challenging to treat because it affects your entire lymphatic system rather than just one location.

What are the symptoms of Castleman disease?

The symptoms of Castleman disease can vary significantly depending on which type you have. Some people experience very mild symptoms, while others feel quite unwell with multiple symptoms affecting their daily life.

If you have unicentric Castleman disease, you might experience:

• A painless lump or swelling in your neck, armpit, or groin
• Mild discomfort or pressure in the affected area
• Occasional fatigue or feeling slightly run down

These symptoms often develop slowly and may not significantly impact your daily activities.

Multicentric Castleman disease typically causes more noticeable symptoms throughout your body:

• Persistent fatigue that doesn't improve with rest
• Fever that comes and goes without an obvious cause
• Unintentional weight loss over several weeks or months
• Excessive sweating, especially at night
• Swollen lymph nodes in multiple areas of your body
• Skin rashes or changes in skin color
• Shortness of breath during normal activities
• Nausea or loss of appetite

These symptoms can significantly affect how you feel day to day and often prompt people to seek medical attention.

What causes Castleman disease?

The exact cause of Castleman disease isn't fully understood, but researchers have identified several factors that may contribute to its development. Your immune system plays a central role in this condition, though the triggers can vary.

For unicentric Castleman disease, the cause often remains unknown. Your immune system may simply overreact in one area, causing lymph nodes to grow larger than normal. This type doesn't seem to be linked to infections or other specific triggers in most cases.

Multicentric Castleman disease has more identifiable connections. A virus called human herpesvirus 8 (HHV-8) is found in many people with this form, particularly those who also have a weakened immune system. This virus can trigger the abnormal immune response that characterizes the condition.

Other factors that may contribute include autoimmune conditions where your immune system mistakenly attacks healthy tissue. Sometimes, having HIV or other conditions that weaken your immune system can increase your risk of developing multicentric Castleman disease.

When should you see a doctor for Castleman disease?

You should contact your doctor if you notice persistent swollen lymph nodes that don't go away after a few weeks. While swollen lymph nodes are often caused by common infections, those related to Castleman disease typically don't shrink back to normal size on their own.

Seek medical attention promptly if you experience unexplained fever, significant weight loss, or persistent fatigue that interferes with your daily activities. These symptoms, especially when they occur together, warrant evaluation by a healthcare professional.

Don't wait to see your doctor if you develop multiple swollen lymph nodes in different parts of your body, such as your neck, armpits, and groin simultaneously. This pattern is less common with typical infections and should be evaluated.

Contact your healthcare provider immediately if you experience severe symptoms like difficulty breathing, chest pain, or severe abdominal pain. While rare, these could indicate complications that need urgent attention.

What are the risk factors for Castleman disease?

Several factors may increase your likelihood of developing Castleman disease, though having these risk factors doesn't mean you'll definitely develop the condition. Understanding these factors can help you and your doctor stay alert to potential symptoms.

Having a weakened immune system is the most significant risk factor, particularly for multicentric Castleman disease. This includes people with HIV, those taking immunosuppressive medications, or anyone with conditions that compromise immune function.

Age can also play a role, though Castleman disease can occur at any time in life. Unicentric disease often affects younger adults in their 20s and 30s, while multicentric disease is more common in people over 50.

Infection with human herpesvirus 8 (HHV-8) significantly increases your risk of developing multicentric Castleman disease. This virus is more common in certain geographic regions, including parts of Africa and the Mediterranean.

Men appear to be slightly more likely to develop multicentric Castleman disease than women, though the reasons for this difference aren't completely clear. However, both types of the condition can affect people of any gender.

What are the possible complications of Castleman disease?

Castleman disease can lead to various complications, particularly if it's not properly treated or if you have the multicentric form. Understanding these potential complications helps explain why prompt diagnosis and treatment are important.

Common complications that may develop include:

• Severe anemia that causes extreme fatigue and weakness
• Kidney problems that affect how well your kidneys filter waste
• Liver dysfunction that can cause yellowing of your skin or eyes
• Increased risk of infections due to immune system dysfunction
• Heart problems, including an enlarged heart or irregular heartbeat
• Lung complications that can cause breathing difficulties

These complications occur because the overactive immune response affects multiple organ systems throughout your body.

In rare cases, multicentric Castleman disease can increase your risk of developing certain types of lymphoma, a form of blood cancer. This risk is higher in people who also have HIV or HHV-8 infection. However, with proper monitoring and treatment, this complication can often be prevented or detected early.

Some people may also develop a condition called POEMS syndrome, which affects multiple body systems and can cause nerve damage, skin changes, and other serious symptoms. This is an uncommon but serious complication that requires specialized treatment.

How is Castleman disease diagnosed?

Diagnosing Castleman disease requires several steps because its symptoms can be similar to other conditions. Your doctor will start with a thorough examination and medical history to understand your symptoms and how long you've had them.

Blood tests are usually the first diagnostic step. These tests check for signs of inflammation, anemia, and other abnormalities that commonly occur with Castleman disease. Your doctor may also test for specific infections like HHV-8 or HIV that can be associated with the condition.

Imaging studies help your doctor see which lymph nodes are enlarged and where they're located. CT scans or PET scans can show swollen lymph nodes throughout your body and help determine whether you have unicentric or multicentric disease.

A lymph node biopsy is usually necessary to confirm the diagnosis. During this procedure, your doctor removes a small piece of an enlarged lymph node to examine under a microscope. This test can definitively identify the characteristic cell patterns seen in Castleman disease.

Your doctor might also perform a bone marrow biopsy if they suspect complications or need more information about how the condition is affecting your blood cells. This test involves taking a small sample from inside your bone to examine the cells that produce your blood.

What is the treatment for Castleman disease?

Treatment for Castleman disease depends on which type you have and how severe your symptoms are. The good news is that effective treatments are available for both forms of the condition, though the approach differs significantly.

For unicentric Castleman disease, surgical removal of the affected lymph nodes is often the preferred treatment. This approach can be curative because the disease is limited to one area. Most people feel much better after surgery and don't need additional treatment.

Multicentric Castleman disease requires more complex treatment because it affects multiple areas of your body. Your treatment plan might include:

• Immunotherapy medications that help regulate your immune system
• Chemotherapy drugs that control the abnormal cell growth
• Antiviral medications if you have HHV-8 infection
• Corticosteroids to reduce inflammation and symptoms
• Targeted therapy drugs that block specific proteins involved in the disease

Your doctor will work with you to develop a treatment plan that addresses your specific symptoms and overall health status.

Rituximab is a commonly used medication that targets specific immune cells involved in Castleman disease. Many people respond well to this treatment, experiencing reduced symptoms and smaller lymph nodes. Treatment typically involves receiving the medication through an IV over several months.

If you have HIV along with Castleman disease, treating the HIV infection with antiretroviral therapy is crucial. Controlling HIV can significantly improve your response to Castleman disease treatment and reduce the risk of complications.

How can you manage symptoms at home during treatment?

While medical treatment is essential for Castleman disease, there are several things you can do at home to help manage symptoms and support your overall health during treatment. These strategies can help you feel more comfortable and maintain your strength.

Getting adequate rest is crucial, especially if you're experiencing fatigue. Listen to your body and don't push yourself too hard on days when you feel tired. Plan your activities for times when you typically have more energy, and don't hesitate to ask for help with daily tasks.

Eating a nutritious diet can help support your immune system and maintain your strength. Focus on foods rich in protein, vitamins, and minerals. If you're losing weight or have a poor appetite, try eating smaller, more frequent meals throughout the day.

Staying hydrated is important, particularly if you're experiencing fever or sweating. Drink plenty of water throughout the day, and consider electrolyte drinks if you're losing fluids through sweating.

Monitor your symptoms and keep track of any changes. Note when symptoms are better or worse, and share this information with your healthcare team. This can help them adjust your treatment plan if needed.

Take steps to prevent infections since your immune system may not be working normally. Wash your hands frequently, avoid crowded places when possible, and stay up to date with recommended vaccinations as advised by your doctor.

How should you prepare for your doctor appointment?

Preparing for your doctor appointment can help ensure you get the most out of your visit and provide your healthcare team with the information they need. Taking some time to organize your thoughts and questions beforehand can make the appointment more productive.

Write down all your symptoms, including when they started and how they've changed over time. Be specific about things like the location of swollen lymph nodes, how severe your fatigue is, and whether you've had any fevers or weight loss.

Bring a complete list of all medications you're taking, including prescription drugs, over-the-counter medications, and any supplements. Also, note any allergies you have to medications or other substances.

Gather your medical history, including any recent blood tests, imaging studies, or previous biopsies. If you've seen other doctors about these symptoms, try to obtain copies of those records to share with your current healthcare team.

Prepare a list of questions to ask your doctor. You might want to know about treatment options, potential side effects, how long treatment might take, or what to expect during recovery. Don't hesitate to ask about anything that concerns you.

Consider bringing a family member or friend to your appointment. They can help you remember important information and provide emotional support during what might be a stressful time.

What's the key takeaway about Castleman disease?

Castleman disease is a rare but treatable condition that affects your lymph nodes and immune system. While it can cause concerning symptoms like persistent fatigue, fever, and swollen lymph nodes, effective treatments are available for both forms of the disease.

The most important thing to remember is that early diagnosis and appropriate treatment can significantly improve your outlook. If you have unicentric disease, surgical removal of affected lymph nodes can often provide a cure. For multicentric disease, various medications can help control symptoms and prevent complications.

Working closely with your healthcare team is essential for managing this condition successfully. Regular monitoring, following your treatment plan, and maintaining open communication with your doctors will help ensure the best possible outcome.

While living with Castleman disease can be challenging, many people go on to live full, active lives with proper treatment. Don't hesitate to reach out for support from your healthcare team, family, and friends as you navigate this journey.