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CION Cancer Clinics
Low haemoglobin in older adults: the usual causes | CION Cancer Clinics
Low haemoglobin in older adults is common, but ageing alone does not cause it. The usual reasons are slow blood loss from the gut, a long-running illness such as kidney disease, and low iron, vitamin B12 or folate. Less often the bone marrow is the cause. This page explains each cause, the signs families miss, and how doctors find the reason for your parent. 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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On this page
- Is low haemoglobin just part of getting older?
- What usually causes low haemoglobin in older adults?
- How do doctors work out the cause?
- What do families often get wrong?
- Which everyday changes could be low haemoglobin?
- What should you do next, and what can this page not tell you?
- Common questions about low haemoglobin in older adults
The short answer
Is low haemoglobin just part of getting older?
No. Low haemoglobin is common after sixty, but ageing on its own does not cause it. In most older adults there is a reason, and the usual ones are slow blood loss from the gut, a long-running illness such as kidney disease, or low vitamin B12, folate or iron.
What the numbers on the report mean
Your report prints a normal range beside the haemoglobin result. The World Health Organization sets its low cut-off slightly higher for men than for women, and a result below the range on your report is flagged as low. These cut-offs are a guide, not a verdict. Reference ranges differ between laboratories, and a single result is always read alongside symptoms and a repeat test.
Why older people get missed
In a parent in their seventies, tiredness, breathlessness on the stairs, poor appetite and low mood are easy to put down to age. The family often notices before the parent does. A mild drop can also be the first sign of something that is far easier to deal with when found early, such as a bleeding ulcer or a growth in the bowel.
A low count in an older person deserves an explanation, even when it is only a little below the range.Where it comes from
What usually causes low haemoglobin in older adults?
Often there is more than one cause at once. That is why the doctor may keep looking after finding the first.
Slow bleeding from the gut
A small, steady loss of blood that you cannot see drains iron over months. Stools may look normal.
Common sources
- Stomach ulcers, often from regular painkillers
- Piles or small pouches in the bowel
- A growth in the stomach or bowel
Long-running illness
Kidney disease, diabetes, joint inflammation, heart failure and old infections can all slow the making of red cells, even when iron stores are full.
Low B12, folate or iron in the diet
Eating less, a strict vegetarian diet, poor teeth and living alone all play a part. Some acid-lowering tablets and the diabetes medicine metformin can lower B12 over years.
Do not stop any of these medicines on your own. Ask the doctor who prescribed them.A problem in the bone marrow
Less often, the marrow itself is the cause. Conditions such as myelodysplastic syndrome (a marrow that makes faulty cells) or myeloma become more common with age and need a haematologist.
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When it cannot wait until the next appointment
If an older person with low haemoglobin passes black or bloody stools, vomits blood, faints, has chest pain or becomes breathless at rest, go to the nearest emergency department today or call 108. Take the latest blood report and the list of medicines, including any blood thinner. Do not wait to see whether it settles on its own.
Finding the reason
How do doctors work out the cause?
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A full history and the medicine list
The doctor asks about appetite, weight loss, stool colour, painkiller use, diet and past illness. Bring every tablet strip, including ayurvedic or home remedies.
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Repeat blood count with the red cell size
The size of the red cells, shown as MCV on the report, points the search. Small cells suggest iron loss. Large cells suggest low B12 or folate, or a marrow cause.
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Iron, B12, folate and kidney tests
Ferritin shows iron stores. Kidney and liver tests show whether a long-running illness is holding the count down.
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Looking inside the gut, where needed
If iron is low with no clear reason, a camera test of the stomach or bowel is often suggested. In an older adult this step matters, because it can find a bleeding source early.
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Referral to a haematologist
If the cause is still unclear, or other counts are also abnormal, a blood specialist reviews the smear and decides whether a bone marrow test is needed.
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Commonly believed
What do families often get wrong?
"At her age, a low count is normal."
It is common, but it is not normal. Healthy older adults usually keep their haemoglobin in range. A low result is a sign to look for a reason, not a number to accept.
"We will just start iron tablets and see."
Iron can lift the count and hide a bleeding ulcer or bowel growth underneath. Find the cause first, then let the doctor decide whether iron is the right treatment at all.
"A tonic and green leaves will fix it."
Diet helps once the cause is known. It does not correct low B12 caused by poor absorption, and it does nothing for a count held down by kidney disease or a marrow problem.
"He is too old for tests, so why bother?"
Many of the tests are simple blood samples. Where a camera test or marrow test is suggested, the team weighs your parent's overall fitness and wishes. Knowing the cause often makes day-to-day life easier, even when treatment is kept gentle.
At home
Which everyday changes could be low haemoglobin?
What the family notices
Why it may matter
Sleeping more, sitting more, giving up the evening walk
Less oxygen reaches the muscles, so effort tires faster
New confusion, poor memory or falls
The brain is sensitive to a low count in older age
Breathless on the stairs, or ankle swelling
The heart works harder to make up for fewer red cells
Pale gums and inner eyelids, or tingling in the feet
Paleness points to a low count; tingling can point to low B12
Being straight with you
What should you do next, and what can this page not tell you?
This page cannot tell you why your own parent's haemoglobin is low. Only the tests above can do that. A list of causes is not a diagnosis, and the most likely cause for one person may be rare for another.
Treatment follows the cause
Iron suits someone who is short of iron. B12 injections or tablets suit someone short of B12. Neither helps a count held down by kidney disease or a marrow condition. A blood transfusion lifts the count quickly, but it is not suited to everyone, because a weak heart can struggle with the extra fluid. The treating team decides this, not the family.
When to ask for a blood specialist
Ask for a haematologist's opinion if the count keeps falling, if iron has not helped, or if the white cells or platelets are also out of range. At CION, Dr. Basudev Pokhrel and the haematology team review the full set of reports, discuss the case at a tumour board where needed, and help arrange any test that is done at another centre.
Bring every blood report you have, old and new. The trend over time often says more than one result.Questions we are asked
Common questions about low haemoglobin in older adults
My father's haemoglobin is a little low. Should we worry?
Not panic, but do not ignore it. A mild drop in an older adult still needs a reason, because slow bleeding and low B12 are common and treatable. Ask his doctor to repeat the count and check iron, B12, folate and kidney function. Reference ranges differ between laboratories, so read the result against the range on his report.
Can blood pressure or diabetes medicines cause it?
Some can play a part. Metformin and long-term acid-lowering tablets can lower B12 over years. Blood thinners and regular painkillers can make gut bleeding more likely. This does not mean the medicine is wrong for him. Tell the doctor everything he takes and never stop a medicine without asking first.
Does low haemoglobin in an elderly person mean cancer?
Usually not. Most cases come from iron loss, a long-running illness or low vitamins. A bowel or stomach growth, or a marrow condition such as myeloma, is one of the causes doctors check for, which is why the tests matter. A normal result on one test does not rule these out on its own.
Why does the doctor want a camera test of the stomach?
When iron is low in an older adult and there is no obvious reason, the gut is the most common place blood is being lost. A camera test can find an ulcer, a bleeding spot or a growth. The team considers your parent's fitness first and will explain the benefits and the discomfort before you decide.
Can we give iron tablets at home without tests?
It is better not to. Iron can raise the count and hide the cause, and it does not help if the problem is B12, kidney disease or the marrow. Iron tablets also upset the stomach and cause constipation in many older people. Ask for the cause to be found first, then follow the plan the doctor gives.
Will she need a blood transfusion?
Most older adults with low haemoglobin do not. A transfusion is usually kept for a very low or fast-falling count, or for symptoms such as chest pain or breathlessness at rest. The decision depends on her heart, her symptoms and the cause, and it is made by the treating team.
Is a bone marrow test needed for everyone?
No. Most causes are found with blood tests and, where needed, a camera test of the gut. A marrow test is considered when the cause stays unclear, when the cells look abnormal on the smear, or when other counts are also low. A haematologist explains why before suggesting it.
What should we bring to the haematology appointment?
Bring every blood report in date order, any scan or camera test results, discharge summaries, and the actual strips of every medicine and supplement. A short note of symptoms, falls and weight change helps. If a son or daughter manages the medicines, it helps if they come 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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Sources
- World Health Organization — Anaemia fact sheet
- NHS — Iron deficiency anaemia
- NHS — Vitamin B12 or folate deficiency anaemia
- NICE Clinical Knowledge Summaries — Anaemia - iron deficiency
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 low haemoglobinWhat each blood test and camera test is looking forLow haemoglobin from long-running illnessWhen kidney disease or inflammation holds the count downWhen iron tablets do not raise the countWhat to check if iron has not helpedWhen low haemoglobin needs a haematologistSigns it is time for a blood specialist
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