Hematologist
CION Cancer Clinics
Anaemia in men always needs an explanation | CION Cancer Clinics
Anaemia, a low haemoglobin, is uncommon in adult men, so it always needs a reason. The most common one is slow, hidden blood loss from the stomach or bowel. Others include low vitamin B12, kidney disease and, less often, a bone marrow problem. This page covers the warning signs that need care today, the usual causes, and the tests that find them. At CION Cancer Clinics, our haematologist cares for anaemia, bleeding, clotting and inherited blood disorders, with ArogyaSri, CGHS and cashless insurance accepted.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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The short answer
Why does anaemia in a man always need a reason?
Anaemia, a low haemoglobin, is uncommon in an adult man, so it should never be put down to weakness or diet alone. The most common reason is slow, hidden blood loss from the stomach or bowel, and that is why doctors look for a source before simply giving iron.
Why men are treated differently from women
Women lose blood every month through periods, and pregnancy uses up iron. Those two explanations do not apply to a man. When a man's iron runs low, the body is usually losing blood somewhere, or not absorbing what he eats. Neither of those should be left unexplained.
What the search is really looking for
Most of the causes found are treatable and are not cancer: an ulcer, piles, a stomach infection, long use of pain-killers, worms, or a diet short in vitamin B12. A smaller number of men have a growth in the stomach or bowel, a kidney problem, or a condition of the bone marrow. Finding a bowel growth while the only sign is a low haemoglobin often means it is found at an earlier stage.
Who this page is for
It is written for the man holding the report, and for the son or daughter who has noticed that their father is pale, tired or breathless on the stairs and has been told it is "just a little blood less".
Reference ranges for haemoglobin differ between laboratories. A single result is read alongside symptoms and a repeat test.
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Go to the emergency department today if
You pass black, tarry or sticky stools, vomit blood or something that looks like coffee grounds, pass fresh blood from the back passage, feel breathless at rest, have chest pain, or faint. Go to the nearest emergency department now, or call 108. Take your latest blood report, and tell them about any blood thinner or pain-killer you take. Do not wait for a clinic appointment.
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Ask an oncologistWhere it comes from
What usually causes anaemia in men?
The causes fall into four groups. More than one can be present at once, especially in older men.
Blood being lost
Slow bleeding from the stomach or bowel is the cause most often found. It usually causes no pain and the stool may look normal.
Often found
- Ulcers, often from pain-killers
- Piles and bowel polyps
- Growths in the stomach or bowel
- Hookworm infection
Not absorbing enough
The gut may not take up iron or vitamin B12 from food, even with a good diet.
Often found
- Coeliac disease, a reaction to wheat
- Past stomach surgery
- Low B12 in a vegetarian diet
- Long use of acid-reducing tablets
Other long-term illness
Kidney disease, liver disease, diabetes, long infections such as tuberculosis, and inflammation of the joints can all slow red cell making.
Heavy alcohol use can also lower the count and enlarge the red cells.The bone marrow or blood itself
Less often, the marrow is not making enough cells, or red cells break down early. An inherited trait such as thalassaemia can also show up. This is more likely when white cells or platelets are abnormal too.
The investigation
What tests will the doctor usually do, and in what order?
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Questions and examination
Expect questions about stool colour, piles, indigestion, weight loss, appetite, alcohol, diet and every tablet you take, including pain-killers bought without a prescription. The doctor also examines your belly and may do a rectal check.
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First blood tests
A full blood count with red cell size, a blood smear, ferritin (your iron stores), vitamin B12, folate, and kidney and liver tests. The size of the red cells guides everything that follows.
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Coeliac and stool tests
A blood test for coeliac disease is commonly added when iron is low. A stool test for hidden blood or worms may be asked for.
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Camera tests of the gut
For a man with low iron and no clear reason, an upper endoscopy of the stomach and a colonoscopy of the bowel are usually advised, often on the same day. This is the step families most often want to skip.
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A haematologist's review
If iron is not low, if the gut tests find nothing, or if other counts are abnormal, a blood specialist reviews the whole pattern. A bone marrow test is done only when the blood tests cannot explain the picture.
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Commonly believed
What do families often say, and what is true?
"He is just weak. A tonic and iron tablets will do."
Iron may raise the count for a while and hide the reason it fell. If a slow bleed is the cause, it carries on underneath. Start with the tests, and do not start or stop any medicine on your own. Tell the doctor if iron has already been started.
"His stools look normal, so there is no bleeding."
The amount of blood lost in a slow bleed is often too small to see. Stools only turn black when the bleeding is heavier. A normal-looking stool does not rule out a bleed from the gut.
"He has no stomach pain, so a camera test is not needed."
Ulcers in people taking pain-killers, and early bowel growths, often cause no pain in their early stages. The absence of pain is exactly why the camera test is the way to look.
"He is vegetarian, so it must be diet."
Diet can explain low B12 and sometimes low iron, but a vegetarian man can also have a bleed. Diet is a reason to test B12, not a reason to skip looking at the gut.
Reading the pattern
What does your report point towards?
What the report shows
What the doctor usually looks at next
Small red cells with low ferritin
Blood loss from the gut, coeliac disease, worms
Small red cells with normal ferritin
An inherited trait such as thalassaemia, or long illness
Large red cells
Low B12 or folate, alcohol, liver or thyroid, the marrow
Normal-sized red cells
Kidneys, long illness, an early bleed
White cells or platelets also abnormal
A prompt haematologist review, without waiting
Being straight with you
What can this page not tell you?
This page cannot tell you why your own haemoglobin is low. A list of causes is not a diagnosis, and the most likely cause on paper may not be the one you have. Only your history, your examination and your tests can answer that.
It does not mean cancer, and it does not rule it out
Most men who are investigated turn out to have a cause that is not cancer. Some do have a growth, and finding it while the only sign is anaemia is the reason the tests are worth doing. Going through the tests is the way to know either way.
When the tests may be put off
A camera test may be delayed or changed for a man who is very frail, has a serious heart or lung condition, or is on blood thinners that cannot be paused safely. That decision belongs to the treating team, who weigh the risk of the test against what it could find.
How CION can help
CION's haematology team, led by Dr. Basudev Pokhrel, reviews your reports, explains the pattern, and helps you arrange the right tests with qualified centres where needed.
Questions we are asked
Common questions about anaemia in men
Is anaemia in men always serious?
Not always serious, but always worth explaining. Many men turn out to have an ulcer, piles, worms or low B12, all of which can be treated. The concern is that the same low number can also come from a bowel growth or a marrow problem, and the report alone cannot tell these apart.
Can I just take iron tablets and repeat the test?
Not without a doctor finding the reason first. Iron can raise the count while a slow bleed carries on, which delays the real answer. If your doctor has already started iron, keep taking it as prescribed and ask whether the camera tests are still needed. Do not stop or change it on your own.
Why do I need both an endoscopy and a colonoscopy?
Bleeding can come from the upper gut, the stomach and food pipe, or the lower gut, the bowel. Some men have a cause in both. An endoscopy looks at the upper part, and a colonoscopy at the lower part. They are often done on the same visit under sedation, so you are drowsy and comfortable.
My father takes pain-killers for his knees. Could that be it?
It could. Regular pain-killers such as ibuprofen or diclofenac can cause stomach ulcers that bleed slowly without pain. Tell the doctor exactly which ones he takes and for how long. Do not stop them suddenly on your own; the doctor will suggest a safer plan while the tests are done.
Does being tired and pale mean it is anaemia?
Not always. Tiredness has many causes, including thyroid problems, diabetes, poor sleep and low mood. Paleness can be hard to judge on darker skin. A simple full blood count answers the question, and it is inexpensive and widely available across Telangana and Andhra Pradesh.
Can a young man be anaemic from diet alone?
Yes, particularly with a strict vegetarian diet short in B12, or with worm infection in some settings. Even so, a young man with low iron and no clear dietary reason should still have coeliac disease and the gut considered. Your doctor decides how far to look based on your age, symptoms and report.
What if all the tests come back normal?
Then a haematologist, a blood specialist, reviews the whole picture. Less common causes include a slow bleed in the small bowel, kidney hormone shortage, red cells breaking down early and early marrow conditions. Keep every report, because a change over time often tells more than one result.
Can CION arrange the investigation?
CION's haematology team reviews your reports, advises which tests are needed and in what order, and helps you reach qualified centres for camera tests and specialist blood tests where needed. Call the helpline with your latest report, and we will tell you the sensible next step.
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 — Iron deficiency anaemia
- NICE Clinical Knowledge Summaries — Anaemia - iron deficiency
- NHLBI — Anemia
- NHS — Vitamin B12 or folate deficiency anaemia
- American Society of Hematology — Anemia
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 Tests Find the Cause of AnaemiaEach test in the investigation, in orderAnaemia That Does Not Improve With IronWhen iron tablets are not workingWhen Anaemia Needs a HaematologistPatterns that should go to a blood specialistAnaemia: Recognising and Classifying ItThe full guide to low haemoglobin
Talk to us
Has a man in your family been told his haemoglobin is low?
Share the report or call the helpline. CION's haematology team will explain the pattern and the sensible next tests. One helpline serves every CION centre.