Cyclic Neutropenia: Symptoms, Causes, Treatment and Outlook — What You Need to Know
Updated: 1 hour ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: September 2026
Quick answer
Cyclic neutropenia is a rare blood disorder in which neutrophils, the most common type of white blood cell, regularly dip to low levels, then return to normal. The dip typically lasts three to five days and repeats roughly every three weeks. Low neutrophils weaken your ability to fight bacteria and viruses, so infections tend to appear on the same schedule. Most people inherit a variant of the ELANE gene from one parent. There is no cure, but treatment with antibiotics and a medicine called granulocyte colony-stimulating factor (G-CSF) keeps counts at safe levels, and the outlook with the right treatment is excellent.
TL;DR
Cyclic neutropenia lowers your neutrophil white blood cells on a predictable cycle: about three to five days of low counts repeating roughly every three weeks. Symptoms such as fever, sore throat, mouth sores, and dental issues show up during the low window. It usually stems from an inherited ELANE gene variant, and researchers estimate only about 1 in every 1 million people has this rare condition. A fever of 100.4°F (38°C) or higher lasting more than an hour should prompt a call to your provider, and a fever with shaking chills, confusion, or a fast heartbeat needs emergency care. Treatment includes antibiotics and G-CSF, and with it, most people live a healthy life.
What this guide can and cannot tell you: everything below comes from a single, medically reviewed reference page. It gives the cycle pattern, the symptom list, the ELANE gene mechanism, the diagnostic process, and the treatment options. It does not contain age-by-age prevalence figures, long-term survival statistics, or personal outcome predictions. That data is not published in the source, and nothing here is invented to fill the gap.
What is cyclic neutropenia?
Neutrophils are the most common kind of white blood cell. Their job is to fight off the bacteria and viruses that make you sick. Neutropenia is the medical word for a shortage of neutrophils, and it makes it hard for your immune system to defend you. (A related but different condition is agranulocytosis, a rare and dangerous drop in these cells.)
Cyclic neutropenia is a special form of neutropenia. The low counts do not stay low all the time. Instead, neutrophil levels drop, stay low for about three to five days, then climb back to normal, and the pattern repeats on a fairly consistent, predictable schedule, dropping again roughly every three weeks.
Because neutrophil levels rise and fall, your infection risk rises and falls with them. You are most vulnerable during the low-count window and much better protected the rest of the cycle.
Key fact | What the reference page says |
What it is | Neutrophil levels that regularly dip below normal, then return to normal |
The cycle | Levels stay low for about 3 to 5 days, then drop again roughly every 3 weeks |
How rare | Researchers estimate about 1 in every 1 million people has it |
Cell involved | Neutrophils, the most common type of white blood cell |
Specialist | A hematologist (blood disease specialist) monitors your neutrophil levels |
Cure status | No cure, but an excellent outlook with the right treatment |
Why do neutrophil levels drop on a cycle?
The timing is what makes this condition unique. During each cycle, your body still makes neutrophils that protect you. But the underlying gene problem causes some of them to die too soon.
That creates a gap period: your counts fall while your body is busy producing the next batch of neutrophils. This gap is likely why the low levels happen in a repeating cycle rather than staying low permanently.
How does cyclic neutropenia differ from other neutropenia?
Other forms of neutropenia keep neutrophil counts low more steadily. In the cyclic form, counts recover on their own between episodes. The reference page notes that low neutrophil levels and the same gene mutation can also appear in other forms of neutropenia, which is why doctors confirm the cyclic pattern with repeated testing (see the diagnosis section below).
What are the symptoms of cyclic neutropenia?
Symptoms appear on a regular schedule, during the days when neutrophils are low and your immune system struggles to fight infections. They include:
Symptom | What to notice |
Fever | Often the main warning sign; a fever over 100.4°F (38°C) lasting more than an hour means call your provider |
Sore throat | Shows up during low-count windows |
Mouth sores | Especially common in adolescents and young adults |
Dental issues | Inflamed, bleeding, or swollen gums; gum disease in younger people |
Fatigue | Tiredness during low-count periods |
Headaches | More common in adults, along with sinus infections |
Skin pain or rash | Skin symptoms during the low window |
Swollen lymph nodes | Glands enlarging as the body fights off infection |
Symptoms can change over time, including in how severe they are. The reference page notes that symptoms often get milder after puberty. Age also shifts the pattern: adolescents and young adults are more likely to have dental issues like gum disease and mouth sores, while adults more often get headaches and frequent sinus infections.
Does it affect children differently from adults?
The cycle is the same, but the symptom mix shifts with age. Younger people tend to experience the dental and mouth-sores side of the condition; adults tend to experience headaches and recurring sinus infections. Symptoms in general often become milder after puberty.
What causes cyclic neutropenia?
Most people with cyclic neutropenia inherit a variant of the ELANE gene. You only need to inherit the variant from one biological parent to have the condition.
The ELANE gene normally tells neutrophils how to make an enzyme that fights infections. The variant version does not always work as well. Your body still produces neutrophils that protect you, but the variant causes some of them to die too soon, creating the gap period of low counts described above.
Can you get it without inheriting it?
Yes. Some people are born with a normal ELANE gene, but it changes (mutates) at some point in their lifetime. Researchers are not sure why this happens.
How common is cyclic neutropenia?
Researchers estimate that only about 1 in every 1 million people has this rare condition. The source does not publish prevalence by age, sex, or region, so no further numbers are quoted here.
What are the complications of cyclic neutropenia?
The core risk is infection. A weakened immune system raises your risk of all infections, and minor infections can become serious without enough neutrophils to protect you. In the most serious cases, an infection can spread through the body, as described in our guide to sepsis.
Keeping your neutrophil counts at safe levels with treatment is what prevents these complications. In other words, the complication risk is real but manageable, and staying on your treatment plan is the protection.
How is cyclic neutropenia diagnosed?
Healthcare providers diagnose most people in infancy. A family history of the condition often raises the suspicion first.
Diagnosis involves two layers. First, a blood test confirms whether neutrophils are low. Low levels are defined as fewer than 200 neutrophils per microliter of blood. A genetic test can then check for an atypical ELANE gene.
Second, because low neutrophil levels and the gene mutation also occur in other forms of neutropenia, doctors need to prove the cyclic pattern. To do that, your provider may measure your neutrophil counts two to three times per week for about six weeks, watching to see whether your symptoms appear and disappear on a cycle.
Diagnostic step | What it shows |
Blood test | Whether neutrophils are below the 200 per microliter threshold |
Genetic test | Whether an atypical ELANE gene is present |
Repeated counts (2 to 3 times/week for about 6 weeks) | Confirms the rising-and-falling cycle that distinguishes it from other neutropenias |
Family history review | Often the first clue, especially since the variant can be inherited from one parent |
How is cyclic neutropenia treated?
Treatment has two jobs: cure any infections that take hold, and boost your neutrophils to healthy levels so future infections are prevented.
Treatment | How it works | Key notes from the reference page |
Antibiotics | Fight the bacteria that cause infections | May cause minor side effects like diarrhea or nausea |
Granulocyte colony-stimulating factor (G-CSF) | Helps your body make more neutrophils; e.g., filgrastim (Neupogen®) | Described as a safe, effective, long-term treatment; the most common side effect is temporary bone pain; providers often manage it with low doses that cause only mild side effects |
Stem cell transplant | Replaces unhealthy neutrophil-forming cells with healthy ones that mature into healthy blood cells | Almost all people do not need it; it may be used if symptoms are severe and do not respond to G-CSF |
What are the side effects of treatment?
Antibiotics may cause minor side effects like diarrhea or nausea. The most common G-CSF side effect is temporary bone pain, which happens because the shot causes your bone marrow, where blood cells get made, to work harder producing neutrophils. Side effects vary based on the type of medicine and the dosage, and providers often use low doses that cause only mild side effects.
When should you seek care? Fever rules for neutropenia
Fever deserves special attention if you have neutropenia. Fevers are common in most people and usually are not cause for concern, but they can signal a serious infection when neutrophils are low.
Call your provider if you have a fever of 100.4 degrees Fahrenheit (38 degrees Celsius) or more that lasts longer than an hour.
Seek emergency care if you have a fever along with any of these symptoms:
Fever plus any of these | Action |
Fast heartbeat | Get emergency care now |
Belly pain or tenderness | Get emergency care now |
Confusion or a change in mental status | Get emergency care now |
Fast and shallow breathing | Get emergency care now |
Shaking chills | Get emergency care now |
Vomiting | Get emergency care now |
The reference page warns that this combination may be a sign of a serious infection that requires immediate care.
What can you expect if you have cyclic neutropenia?
There is no cure for cyclic neutropenia. But the prognosis, the medical word for outlook, is excellent with the right treatment.
Your hematologist will likely check your neutrophil counts every few months or so. You may need regular G-CSF injections so your body makes enough neutrophils to protect you.
Cyclic neutropenia doesn't have to keep you from living a healthy life.
What can you do to feel better and stay safer?
You can likely do all the same things people without neutropenia do. You may just have to take extra care to keep from getting sick. Staying on your treatment plan is essential. The reference page also suggests these everyday protections:
Self-care step | Why it matters |
Avoid large crowds when your numbers are low | Fewer exposure opportunities during your vulnerable window |
Clean surfaces you touch often | Reduces everyday germ exposure |
Get recommended vaccines | Keeps preventable infections out of the picture |
Don't consume spoiled food or drinks | Avoids foodborne infection risk |
Wash your hands often | Your first daily defense |
Keep up with dental care (brushing, flossing, and dentist visits) | Good oral hygiene helps prevent the tooth and gum symptoms of cyclic neutropenia |
Conclusion: an excellent outlook with the right care
Cyclic neutropenia is rare, inherited in most cases, and currently incurable. But its defining feature, the predictable cycle, is also its greatest advantage. You and your hematologist know when the low windows arrive, and treatment keeps neutrophil counts at safe levels through them. Antibiotics clear infections when they occur; G-CSF keeps your body supplied with the neutrophils it needs. The result, in the words of the reference page, is an excellent prognosis and a healthy life.
If you have a family history of cyclic neutropenia, recurring fevers, mouth sores, or dental problems that come and go on a schedule, talk to your doctor. A simple blood test can start the conversation, and early management protects you before the next low-count window arrives.
Frequently asked questions
What is cyclic neutropenia in simple terms? A rare condition where your neutrophil white blood cells (the cells that fight infection) drop to low levels on a repeating schedule: low for about three to five days, then normal, then low again roughly every three weeks.
What is a neutrophil? Neutrophils are the most common type of white blood cell. They help your immune system fight bacteria and viruses that can make you sick.
How long do neutrophil levels stay low? Levels drop for about three to five days before returning to normal, then drop again around every three weeks.
How rare is cyclic neutropenia? Researchers estimate that only about 1 in every 1 million people has this condition, making it very rare.
What is neutropenia? Neutropenia is the medical term for a shortage of neutrophils. A shortage makes it hard for your immune system to fight off bacteria and viruses.
What causes cyclic neutropenia? Most people inherit a variant of the ELANE gene from one biological parent. The variant causes some neutrophils to die too soon, creating the gap period of low counts. Less commonly, a normal ELANE gene mutates at some point in a person's lifetime, for reasons researchers do not yet understand.
Is cyclic neutropenia genetic? In most cases, yes. The ELANE gene variant only needs to be inherited from one parent for the condition to occur. In some people, the gene mutates on its own later in life.
What does the ELANE gene do? The ELANE gene tells neutrophils how to make an enzyme that fights infections. When the gene variant works poorly, some neutrophils die too soon.
What are the symptoms of cyclic neutropenia? Symptoms appear during low-count windows and include fever, fatigue, headaches, sore throat, mouth sores, dental issues like inflamed or bleeding gums, skin pain or rash, and swollen lymph nodes.
Do symptoms change with age? Yes. Symptoms often get milder after puberty. Adolescents and young adults more often have dental issues and mouth sores, while adults more often have headaches and frequent sinus infections.
Is cyclic neutropenia dangerous? The weakened immune system raises your risk of all infections, and minor infections can become serious without enough neutrophils. But treatment that keeps counts at safe levels helps prevent complications, and the prognosis with proper treatment is excellent.
When should I call my doctor about a fever? Call your provider if you have a fever of 100.4°F (38°C) or higher that lasts longer than an hour. Fevers are common and usually not concerning for most people, but with neutropenia they can signal a serious infection.
When is a fever an emergency with neutropenia? Seek emergency care if fever comes with a fast heartbeat, belly pain or tenderness, confusion or a change in mental status, fast and shallow breathing, shaking chills, or vomiting. These may signal a serious infection requiring immediate care.
How is cyclic neutropenia diagnosed? Through a blood test showing fewer than 200 neutrophils per microliter, often a genetic test for the ELANE variant, and repeated blood counts two to three times per week for about six weeks to confirm the repeating cycle.
What neutrophil count is considered low? Fewer than 200 neutrophils per microliter of blood is considered a low level in this context.
Why do doctors repeat blood tests for six weeks? Low neutrophil levels and the ELANE mutation also occur in other forms of neutropenia. Repeated measurements over about six weeks show whether symptoms and counts rise and fall on a cycle, which confirms the cyclic type.
When is cyclic neutropenia usually diagnosed? Most people are diagnosed in infancy, and a family history of the condition often raises the suspicion first.
How is cyclic neutropenia treated? Treatment cures active infections with antibiotics and boosts neutrophils with granulocyte colony-stimulating factor (G-CSF) to prevent future infections. A stem cell transplant is reserved for rare, severe cases that do not respond to G-CSF.
What is G-CSF? Granulocyte colony-stimulating factor is a treatment (filgrastim (Neupogen®) is one example) that helps your body make more neutrophils. It is described as a safe, effective, long-term treatment for cyclic neutropenia.
What are the side effects of G-CSF? The most common is temporary bone pain, because the shot makes your bone marrow work harder to produce neutrophils. Side effects vary by medicine type and dosage, and providers often use low doses that cause only mild side effects.
Do I need a stem cell transplant? Almost all people with cyclic neutropenia do not. It may be needed only if symptoms are severe and do not respond to G-CSF.
Can I live a normal life with cyclic neutropenia? Mostly, yes. You can likely do the same things people without neutropenia do, while taking extra care: avoiding large crowds when counts are low, washing hands often, keeping surfaces clean, getting recommended vaccines, avoiding spoiled food, and maintaining good oral hygiene.
Will the symptoms get better over time? Symptom severity can change over time, and symptoms often get milder after puberty.
Is there a cure for cyclic neutropenia? No. There is no cure. However, the prognosis is excellent with the right treatment, and the condition does not have to keep you from living a healthy life.
What specialist treats cyclic neutropenia? A hematologist (a blood disease specialist) monitors your neutrophil levels, typically every few months, and manages treatment such as regular G-CSF injections.
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Medical disclaimer: This article is for general educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read here.
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