What Is — Neutropenia?
Neutropenia is a low white blood cell count caused by chemotherapy. It has no symptoms of its own — but it means a fever that would normally call for rest at home now means go to hospital immediately.
Medically reviewed by Dr. N. Kiranmayee, Medical Oncologist · Last reviewed September 2026
- Neutrophils defend you — They are the white blood cells that kill bacteria. When they fall too low, your body cannot fight infection on its own.
- Chemo causes it — Most chemotherapy drugs cannot tell the difference between fast-growing cancer cells and the cells that make neutrophils.
- It has no warning symptoms — You will not feel neutropenic. The count is found on a blood test, not by how you feel on a given day.
- Fever changes everything — A temperature of 38°C or above during a low-count period is a medical emergency. Go immediately — not in the morning.
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Neutrophils are the white blood cells that defend you against bacterial infection. Chemotherapy lowers their count, and when that count falls below a safe level — a condition called neutropenia — an ordinary infection can become life-threatening within hours. Most people on chemotherapy will have at least one period of neutropenia during their treatment.
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Call the helpline. It is always better to check than to wait.
What is a neutrophil and why does chemotherapy lower your count?
Neutrophils are a type of white blood cell made in your bone marrow. Their job is to find and destroy bacteria. Without enough of them, your body has almost no first line of defence against infection.
Chemotherapy targets cells that divide rapidly. Cancer cells divide fast — but so do the cells in your bone marrow that produce neutrophils. The drugs cannot tell the difference, so neutrophil production slows after each cycle.
The result is neutropenia — a count low enough that bacteria normally harmless to a healthy person can cause a life-threatening infection. Because neutropenia itself causes no symptoms, the only way to know your count is a blood test.
What do the count bands mean?
| Neutrophil count (ANC ×10⁹/L) | Grade | What it means for you |
|---|---|---|
| 1.5 or above | Normal | Your immune defence is intact. Follow your team's routine advice. |
| 1.0 to 1.49 | Mild — Grade 1 | Slightly reduced. Your team may monitor more closely. Report any fever the same day. |
| 0.5 to 0.99 | Moderate — Grade 2 | Significant reduction. Your infection risk is raised. Any fever or rigor means call your team immediately. |
| Below 0.5 | Severe — Grade 3 or 4 | Your ability to fight infection is severely impaired. A fever at this count is a medical emergency — go to hospital now. |
| Typically falls to its lowest | The nadir | 7 to 14 days after each chemotherapy cycle. This is the highest-risk window. Your team will tell you the timing for your regimen. |
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HUB — Low Blood Counts, Infection and Fever During Chemotherapy
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Frequently asked questions
Will I feel different when I am neutropenic?
No — and this is the most important thing to understand. You will not feel neutropenic. Your energy, appetite and temperature can all seem completely normal while your neutrophil count is dangerously low. This is why the rule exists: if your temperature reaches 38°C or above during chemotherapy, go to hospital regardless of how otherwise well you feel. Waiting to see whether you feel worse is not safe when counts are low.
When is neutropenia at its worst during chemotherapy?
Neutrophil counts typically reach their lowest point — called the nadir — around 7 to 14 days after a chemotherapy cycle. The exact timing depends on the specific drugs you are receiving, and your oncologist will tell you when to expect it. Most teams schedule a blood count check during this window. Knowing which days carry the highest risk helps you and your family know when to be most alert.
Does neutropenia mean my chemotherapy has to stop?
Not automatically. Mild or moderate neutropenia is expected during most regimens and does not mean stopping treatment. Your oncologist may delay the next cycle to let counts recover, adjust the dose, or prescribe a growth factor injection to help your bone marrow produce neutrophils faster. Severe or prolonged neutropenia may need a longer delay. The decision is always weighed against how well your treatment is working for you.
What precautions help during a low-count period?
Your team will give you specific guidance, but commonly recommended steps include avoiding people who are visibly unwell, washing hands frequently, avoiding raw or undercooked food, and wearing gloves when handling soil or open wounds. These steps reduce your exposure to bacteria when your defences are low. They are not a substitute for emergency care at the first sign of fever — precautions lower risk but do not remove it.
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