Eosinophilia
What is Eosinophilia?
Eosinophilia is a condition where you have too many eosinophils in your blood. Eosinophils are white blood cells that help your body fight off parasites and play a role in allergic reactions. Normally, eosinophils make up only 1 to 6 percent of your total white blood cells.
When eosinophil levels rise above normal, it signals that your immune system is responding to something. This could be an allergic reaction, a parasitic infection, or an underlying health condition. Most people discover they have eosinophilia through routine blood work.
Eosinophilia can be mild, moderate, or severe depending on how high the eosinophil count rises. Mild cases often cause no symptoms and may resolve on their own. Severe cases can damage organs and tissues over time. Finding the root cause is essential for proper treatment.
Symptoms
- Skin rashes or hives
- Itching or burning skin
- Wheezing or difficulty breathing
- Runny nose or nasal congestion
- Persistent cough
- Stomach pain or cramping
- Diarrhea or digestive issues
- Unexplained weight loss
- Fatigue or weakness
- Night sweats or fever
Many people with mild eosinophilia have no symptoms at all. The condition is often discovered during routine blood tests for other reasons. Symptoms usually appear only when eosinophil levels are very high or when there is organ damage.
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Causes and risk factors
Eosinophilia develops when something triggers your immune system to produce more eosinophils than normal. Allergic conditions are the most common cause, including asthma, hay fever, eczema, and food allergies. Parasitic infections, especially from worms that enter through contaminated food or water, also raise eosinophil levels. Certain medications can trigger eosinophilia as a side effect, including antibiotics and anti-seizure drugs.
Other causes include autoimmune diseases like lupus or inflammatory bowel disease, fungal infections, and some cancers such as Hodgkin's lymphoma or leukemia. Endocrine disorders like Addison's disease can also elevate eosinophils. In some cases, doctors cannot identify a specific cause, which is called idiopathic hypereosinophilic syndrome. Lifestyle factors like exposure to allergens or living in areas with poor sanitation increase your risk.
How it's diagnosed
Doctors diagnose eosinophilia through a complete blood count, which measures all types of white blood cells. The test provides both a percentage of eosinophils and an absolute eosinophil count. An absolute eosinophil count above 500 cells per microliter indicates eosinophilia. Rite Aid offers testing for eosinophils through our flagship blood panel at over 2,000 Quest Diagnostics locations nationwide.
Once eosinophilia is detected, your doctor will work to identify the underlying cause. This may involve additional tests like stool samples for parasites, imaging scans, or allergy testing. A detailed medical history helps determine whether medications, travel history, or known allergies might explain the elevated levels. Early detection through regular blood testing allows for faster treatment of the root cause.
Treatment options
- Stop taking medications that may be causing the elevated levels
- Treat underlying allergies with antihistamines or allergy medications
- Use corticosteroids to reduce inflammation and eosinophil production
- Take antiparasitic medications if a parasitic infection is found
- Manage asthma with inhalers and controller medications
- Avoid known allergens in food, environment, or products
- Treat autoimmune conditions with immunosuppressive drugs if needed
- Monitor eosinophil levels regularly with blood tests
- Work with an allergist or immunologist for complex cases
- Address nutritional deficiencies that may affect immune function
Concerned about Eosinophilia? Get tested at Rite Aid.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
A normal absolute eosinophil count ranges from 0 to 500 cells per microliter of blood. Eosinophils typically make up 1 to 6 percent of your total white blood cells. Levels above 500 indicate eosinophilia, while levels above 1,500 are considered moderate to severe.
Yes, allergies are one of the most common causes of eosinophilia. Conditions like asthma, hay fever, eczema, and food allergies trigger your immune system to produce more eosinophils. Treating the underlying allergy often brings eosinophil levels back to normal. An allergist can help identify specific triggers through testing.
Mild eosinophilia is usually not dangerous and may resolve on its own. Moderate to severe eosinophilia can cause organ damage over time, especially to the heart, lungs, skin, and nervous system. The danger depends on how high the levels are and whether the underlying cause is treated promptly.
The only way to know if you have eosinophilia is through a blood test that measures your eosinophil count. Many people have no symptoms, especially with mild cases. Rite Aid offers eosinophil testing as part of our comprehensive blood panel, available at Quest Diagnostics locations nationwide.
Yes, parasitic infections are a common cause of eosinophilia, especially infections from roundworms, hookworms, or other worms. Your body produces more eosinophils to fight off these parasites. If you have traveled to areas with poor sanitation or consumed contaminated food or water, parasites may be the cause. Your doctor can order stool tests to check for parasitic infections.
Many medications can cause eosinophilia as a side effect, including certain antibiotics like penicillin, anti-seizure medications, and some pain relievers. Non-steroidal anti-inflammatory drugs and certain psychiatric medications can also raise eosinophil levels. If medication is the cause, stopping the drug usually brings levels back to normal. Always consult your doctor before stopping any medication.
Treatment depends on the underlying cause of your elevated eosinophils. For allergies, antihistamines or allergy medications may help. Parasitic infections require antiparasitic drugs. Corticosteroids reduce inflammation and eosinophil production in severe cases. Your doctor will create a treatment plan based on your specific situation and test results.
In rare cases, eosinophilia can be associated with certain cancers like Hodgkin's lymphoma, leukemia, or other blood disorders. However, cancer is not the most common cause of elevated eosinophils. Your doctor will consider your symptoms, medical history, and additional tests to rule out serious conditions. Most cases of eosinophilia are related to allergies or infections.
Testing frequency depends on your initial eosinophil count and underlying cause. If you have mild eosinophilia with no symptoms, your doctor may recheck levels in 3 to 6 months. People with moderate to severe eosinophilia or ongoing symptoms may need testing every few weeks or months. Regular monitoring helps track whether treatment is working.
Diet can affect eosinophil levels if you have food allergies or sensitivities. Common triggers include dairy, gluten, eggs, soy, and nuts. Eliminating problem foods may lower eosinophil counts. An anti-inflammatory diet rich in vegetables, fruits, and omega-3 fatty acids may support immune health. Work with a doctor or nutritionist to identify food triggers and create a healthy eating plan.