Hematologist
CION Cancer Clinics
Keep getting infections? When to think about your blood | CION Cancer Clinics
Repeated infections are usually not blood cancer. Diabetes, medicines that lower immunity, everyday exposure to germs and other long-term conditions are far more common reasons. A blood problem becomes more likely when infections come with unexplained bruising, weight loss, night sweats or swollen glands. A full blood count is the first step, and this page explains what it can and cannot show you. At CION Cancer Clinics, our haematologist reviews abnormal blood reports with you, orders only the tests that answer your question and explains each result plainly.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- Are frequent infections a sign of blood cancer?
- What else makes infections keep coming back?
- When should repeated infections lead to a blood test?
- What tests usually happen, and in what order?
- What do the words on the blood report mean?
- What do families often get wrong about infections and blood cancer?
- Common questions about repeated infections
The short answer
Are frequent infections a sign of blood cancer?
Usually not. Most people who keep catching infections have a common, treatable reason, such as diabetes, a young child at school bringing germs home, or a medicine that dampens the immune system. Blood cancer is one possible cause, but it is not the likely one, and a simple blood test is the first step to telling them apart.
Why a blood problem can cause infections
Your white blood cells fight germs. They are made in the bone marrow, the soft centre of your bones. Leukaemia, lymphoma and myeloma can crowd the marrow or make white cells that look normal in number but do not work well. When that happens, infections come more often, last longer or keep coming back after antibiotics.
What makes a blood cause more likely
The pattern matters more than the count of colds. A doctor pays closer attention when infections arrive together with other changes: tiredness that sleep does not fix, bruises you cannot explain, drenching night sweats, weight loss without trying, or lumps in the neck, armpit or groin. One of these alone is common. Several together deserve a test soon.
This page cannot tell you why your infections keep returning. It can help you know what to ask for and what the first results do and do not show.Far more common
What else makes infections keep coming back?
Doctors look for these first, because they are much more common than a blood cancer and most of them can be treated.
High blood sugar
Diabetes that is not well controlled slows healing and helps germs grow. Skin, urine and chest infections are all more frequent. Many people find out they have diabetes this way.
Medicines that lower immunity
Steroids taken for a long time, some arthritis medicines and treatment after a transplant all reduce your defences. Do not stop any of them on your own. Ask the doctor who prescribed them.
Everyday exposure
Parents of young children, teachers and health workers simply meet more germs. A run of colds in a school term is expected and is not a sign of a weak immune system.
Other health conditions
Several long-term problems make infections more likely.
Often checked
- HIV infection
- Poor nutrition or low iron
- Kidney or liver disease
- Asthma, allergies or sinus problems
- An inherited immune problem, usually found in childhood
Not sure whether this applies to you?
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When an infection cannot wait
If you are on chemotherapy, or a recent blood test showed a very low white cell count, a fever is an emergency. The same applies to anyone who has a fever with shivering, confusion or fast breathing, or who feels suddenly very unwell. Go to the nearest emergency department now or call 108. Say that the person may have a low white cell count. Do not wait to see whether it settles overnight.
Deciding what to do
When should repeated infections lead to a blood test?
Ask your family doctor for a blood test if infections are coming more often than they used to, taking much longer to clear, or needing one course of antibiotics after another. A test is also sensible if an infection is unusual for you, such as a fungal infection in the mouth without a clear reason, or shingles that is severe or spreads widely.
Signs that raise the level of concern
The doctor will want to see you sooner if infections come with bleeding gums, nosebleeds that are hard to stop, tiny red or purple spots on the skin, looking very pale, breathlessness on light effort, or bone pain. These suggest the marrow may not be making enough of several kinds of blood cell at once.
For the adult child reading this
Older parents often put infections down to age. If your mother or father has had several chest or urine infections close together, and also seems more tired or has lost weight, it is reasonable to ask their doctor for a full blood count. You are not asking for a cancer test. You are asking for the basic test that shows whether a deeper look is needed.
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The usual order
What tests usually happen, and in what order?
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Full blood count
One sample from the arm. It counts your white cells, red cells and platelets, and splits the white cells into their types. This single test answers much of the first question.
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Blood film
If the count looks unusual, a specialist looks at your blood under a microscope. They check whether the cells look normal in shape and whether any immature cells are present.
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Tests for common causes
Blood sugar, kidney and liver tests, and often an HIV test. These are routine, and many of the answers turn up here.
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Antibody levels
Immunoglobulins are the antibodies your body makes. Low levels can point to an immune problem, and some patterns can point towards myeloma or a slow-growing leukaemia.
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Referral to a haematologist
If results suggest a blood disorder, a blood specialist decides whether further tests such as a bone marrow sample or a scan are needed. Most people never reach this step.
On your report
What do the words on the blood report mean?
- WBC or total leucocyte count
- The total number of white cells. Both high and low results can have simple causes, including the infection you already have.
- Neutrophils
- The white cells that fight bacteria first. A low neutrophil count makes serious infections more likely.
- Lymphocytes
- White cells that fight viruses and make antibodies. They often rise during a viral illness and settle afterwards.
- Blasts or atypical cells
- Immature or unusual cells seen on the film. This word needs a specialist to read it, not an internet search.
- Reference range
- The normal band printed beside each result. It differs between laboratories, so compare against your own report.
Commonly believed
What do families often get wrong about infections and blood cancer?
"A normal blood count means nothing is wrong with the immune system."
A normal count is reassuring and makes many blood cancers that affect the marrow much less likely. It does not check how well antibodies work, and it can miss some early or slow-growing conditions. If infections keep coming, tell your doctor even after a normal result.
"Stronger antibiotics each time will build up resistance to infection."
Repeated antibiotics do not strengthen your defences. They can make future germs harder to treat. Finding out why the infections return is more useful than moving to a stronger tablet.
"If it were blood cancer, there would be a lump or pain."
Leukaemia often causes no lump at all. Tiredness, infections and bruising may be the only early signs, which is why the blood count matters more than feeling for swellings.
"Asking for a blood test will only frighten my father."
A full blood count is one of the most routine tests there is. Most results come back with an ordinary explanation, and knowing early is easier on the whole family than weeks of worry.
Questions we are asked
Common questions about repeated infections
How many infections in a year is too many for an adult?
There is no single number that fits everyone. What matters is change and pattern. If you are getting more infections than you used to, they last longer, they need repeated antibiotics, or they come with weight loss, bruising or night sweats, ask your doctor for a blood test rather than counting episodes.
Can leukaemia start with nothing but infections?
Sometimes infections are the first thing people notice, but they rarely come alone. Tiredness, looking pale, easy bruising or bleeding gums usually appear alongside them. A full blood count shows most leukaemias clearly, so if you are worried, that test gives you a real answer instead of guessing.
My white cell count is slightly low. Should I worry?
A mildly low count is common. A recent viral illness, some medicines, and natural variation in some healthy people can all cause it. Reference ranges also differ between laboratories. Your doctor will usually repeat the test and read it with your symptoms. A single slightly low result is not a diagnosis.
My white cell count is very high during an infection. Is that leukaemia?
Infections commonly push the count up. It is your body doing its job. The count usually falls back once the infection clears. If it stays high after recovery, or the blood film shows immature cells, your doctor will look further and may refer you to a haematologist.
Does diabetes explain all my infections?
It can explain many of them, especially skin, foot and urine infections, and better sugar control often helps. It does not rule out another cause. If infections continue after your sugar is well controlled, or you have other symptoms, mention it so your doctor can check further.
Which doctor should I see first?
Start with your family doctor or a general physician. They can arrange the full blood count and the routine tests for common causes. A haematologist, a doctor for blood disorders, becomes useful if those results are unusual. Take a list of your recent infections and any antibiotics you were given.
Can my child's frequent colds mean a blood problem?
Frequent colds are normal for children at school or nursery. See a paediatrician sooner if your child is pale, bruises easily, has bone pain, is losing weight, or has infections that are severe or unusual. Those signs call for a blood test, not a wait and watch.
What should I bring to the appointment?
Bring every blood report you have, including old ones, because a change over time tells the doctor more than one result. Bring a list of medicines, antibiotic courses and the dates of recent infections. If a family member remembers the timeline better, bring them along too.
Your Haematologist
Meet CION's haematologist. One specialist for your blood report and your plan.
Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
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Where to find us
Our centres in and around Hyderabad
Addressed by landmark, because that is how this city navigates. A haematology consultation can be booked at any of these centres through one helpline, and your team will tell you where each test or treatment takes place.
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Sources
- NHS — Acute myeloid leukaemia
- NHS — Chronic lymphocytic leukaemia
- NHS — Sepsis
- Blood Cancer UK — Blood cancer information and support
- American Society of Hematology — Blood disorders for patients
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Which Symptoms Combined Warrant Urgent TestingWhen infections plus other signs need a test soonWhat a Normal Blood Test Does and Does Not Rule OutReading a reassuring result honestlyNight Sweats: Causes Other Than CancerAnother symptom that often travels with infectionsLeukaemia guideWhat leukaemia is, if tests point that wayIs It Cancer? The Crossover ClusterOther symptoms that raise the same question
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