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Anaemia explained: what low haemoglobin actually means | CION Cancer Clinics
Anaemia means your blood carries less haemoglobin, the oxygen-carrying protein in red cells, than it should. The World Health Organization uses below 13 grams per decilitre for adult men and below 12 for women who are not pregnant. It is a finding, not a diagnosis. The real question is why it is low, and that is what the tests after your report are for. 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
- What does low haemoglobin actually mean?
- Why does haemoglobin fall in the first place?
- What do the other words near haemoglobin mean?
- What usually happens after a low haemoglobin result?
- What do families believe about low haemoglobin, and what is true?
- What can this page not tell you, and when do you need a haematologist?
- Common questions about low haemoglobin
The short answer
What does low haemoglobin actually mean?
Anaemia means your blood is carrying less haemoglobin than it should. Haemoglobin is the red protein inside red blood cells that picks up oxygen in the lungs and delivers it to every part of the body. The World Health Organization counts it as anaemia below 13 grams per decilitre in adult men, below 12 in women who are not pregnant, and below 11 in pregnancy.
It is a finding, not a diagnosis
A low haemoglobin tells you that something is lowering your red cells. It does not tell you what. It might be low iron from heavy periods, or slow bleeding from the stomach, or a problem in the bone marrow, the soft tissue inside bones where blood cells are made. The cause matters more than the number.
Why your report may use different numbers
Each laboratory sets its own normal range. A value marked low at one lab may sit just inside the range at another. Your doctor reads a single result alongside your symptoms, earlier reports and usually a repeat test.
Reference ranges differ between laboratories. Always read your result against the range printed on your own report.The causes
Why does haemoglobin fall in the first place?
Almost every cause fits into one of four routes. Knowing which route you are on is what points the doctor to the right tests.
The body is not making enough
Red cells need iron, vitamin B12 and folate to be built. If any of these runs short, the marrow makes fewer or poorer cells. Long-standing kidney disease also slows production, because the kidneys send the signal that tells the marrow to work.
Blood is being lost
Slow, steady blood loss drains iron over months. Heavy periods are the most common reason in women. In men and in women after menopause, hidden bleeding from the stomach or bowel has to be looked for.
Ulcers, piles and regular painkillers that irritate the stomach are common sources.Red cells are destroyed early
Red cells normally last for months. In haemolysis, they break down much sooner. This can be inherited, as in G6PD deficiency or sickle cell disease, or triggered by an infection, a medicine or the immune system.
Yellow eyes and dark urine alongside tiredness can be a sign of this route.The marrow itself is affected
Less often, the factory is the problem. Marrow conditions, including some blood cancers, can crowd out normal cell production. A clue is when white cells or platelets are also abnormal on the same report.
This is the less common route. It is checked for, not assumed.Not sure whether this applies to you?
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When low haemoglobin cannot wait
Go to the nearest emergency department today, or call 108, if you have a low haemoglobin and you are breathless while resting, have chest pain, have fainted, or are passing black, tarry stools or vomiting blood. These can mean the blood count is falling fast or there is active bleeding. Take your latest blood report with you. Do not wait for a routine appointment, and do not try to manage it at home with tonics.
On your report
What do the other words near haemoglobin mean?
- Hb or haemoglobin
- The oxygen-carrying protein in red cells. This is the number that decides whether you have anaemia.
- RBC count
- How many red blood cells are in a set amount of blood. It can be normal even when haemoglobin is low.
- MCV
- The average size of your red cells. Small cells often point to low iron or a thalassaemia trait; large cells often point to low B12 or folate.
- MCH and RDW
- How much haemoglobin each cell holds, and how much the cells vary in size. Together with MCV, they help sort the likely cause.
- Ferritin
- A measure of your stored iron. A low value strongly suggests iron deficiency, though infection can push it up and hide a shortage.
- Reticulocytes
- Young red cells just released from the marrow. The count shows whether the marrow is trying to keep up.
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After the result
What usually happens after a low haemoglobin result?
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The result is confirmed
If the drop is mild and you feel well, your doctor may repeat the test to make sure it is real.
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Your history is taken
Expect questions about periods, diet, stool colour, weight loss, painkillers and blood conditions in the family.
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The first set of cause tests
Usually iron studies, vitamin B12 and folate, kidney function and a blood smear, where a person looks at your cells under a microscope.
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Further tests, only if needed
Depending on what the first tests show, you may be sent for a stool test, an endoscopy to look inside the gut, tests for red cell breakdown, or, less often, a bone marrow test.
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Treating the cause and rechecking
Treatment follows the cause, and your doctor decides it. A repeat blood count after treatment shows whether haemoglobin is rising as expected. If it does not rise, the cause is looked at again.
Commonly believed
What do families believe about low haemoglobin, and what is true?
"Every woman has low blood. It is normal."
It is common in India, but common is not the same as normal. Low haemoglobin in women still has a cause, usually heavy periods or low iron. Left alone, it drains energy and can hide another problem.
"Just buy an iron tonic and it will sort itself out."
Iron helps only when the cause is low iron. It does nothing for low B12, kidney disease or red cell breakdown, and it can make you feel better while a bleeding ulcer keeps bleeding. Speak to your doctor before starting any iron, so the cause is found first.
"Beetroot and pomegranate juice will raise it."
A varied diet with pulses, greens, jaggery, eggs or meat supports iron levels over time. No single juice corrects a real deficiency, and red colour in a food does not mean it carries iron.
"Low haemoglobin means it could be blood cancer."
Most low haemoglobin results come from iron, vitamin or blood-loss causes. Blood cancer is a much less common reason, and it usually shows other changes too, such as abnormal white cells or platelets. It is not assumed, and it is not ignored either: the tests are there to tell the difference.
Knowing the limits
What can this page not tell you, and when do you need a haematologist?
This page cannot tell you why your own haemoglobin is low, or how serious it is for you. The same number means something different in a young woman with heavy periods than in an older man.
Low haemoglobin that always needs an explanation
In men and in women after menopause, there is no monthly blood loss to explain it. Hidden bleeding from the gut has to be ruled out, even if you feel well. The same applies to anyone who has lost weight without trying.
Signs you should ask for a haematologist
A haematologist is a doctor who specialises in blood. Ask for a referral if your white cells or platelets are also out of range, if haemoglobin does not rise with the treatment you were given, if red cells are breaking down, or if the cause is still unclear after the first round of tests. At CION, Dr. Basudev Pokhrel reviews blood reports like these and, where needed, discusses the case with a wider team before a plan is set.
Do not start, stop or change any medicine on your own because of a blood report. Your treating doctor sets the plan.Questions we are asked
Common questions about low haemoglobin
What haemoglobin level is considered low?
By World Health Organization cut-offs, it is below 13 grams per decilitre in adult men, below 12 in women who are not pregnant, and below 11 in pregnancy. Your own laboratory may print a slightly different range, and one result is read with your symptoms.
Is a haemoglobin of 8 dangerous?
Under the WHO grading, a haemoglobin below 8 grams per decilitre in adults is treated as severe. It needs prompt medical review. Whether it is urgent today depends on how fast it fell and how you feel. Breathlessness at rest, chest pain or fainting means going to emergency care now.
Can I have low haemoglobin and feel completely fine?
Yes. When haemoglobin falls slowly over months, the body adjusts and you may notice very little. Feeling well does not mean the cause can be ignored, especially if you are a man or a woman past menopause, where hidden bleeding must be checked.
What is the most common cause in India?
Low iron is the most common cause, often from heavy periods, pregnancy, a diet short in iron, or worms and gut conditions that affect absorption. Low vitamin B12 is also common, particularly in people who eat little or no dairy or meat.
Should I start iron tablets straight away?
Speak to your doctor first. Iron is the right treatment only when the cause is low iron, and taking it without tests can hide a problem such as slow bleeding. Your doctor will usually check ferritin and other markers before deciding. If iron is prescribed, the treating team sets how you take it.
Does low haemoglobin mean I have cancer?
Usually not. Most cases have a common, treatable cause such as low iron or a vitamin shortage. Blood cancers and cancers of the gut can lower haemoglobin, so doctors check for them when the picture fits.
Can thalassaemia trait be mistaken for low iron?
Yes, and it happens often. Both give small red cells and a low or borderline haemoglobin. Iron does not help a trait, and extra iron can build up in the body. A ferritin test and, if needed, a haemoglobin electrophoresis, a test that sorts the types of haemoglobin in your blood, tell them apart.
Which doctor should I see for low haemoglobin?
Start with your family doctor or a physician, who can arrange the first cause tests. A haematologist is the right next step when other counts are abnormal, the cause stays unclear, red cells are breaking down, or haemoglobin does not improve with treatment.
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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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
- 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
Haemoglobin levels: what is normal by age and sexThe normal ranges for children, adults and pregnancyHaemoglobin 8, 9 or 10: how worried should you beWhat each level usually means in practiceMCV, MCH and RDW: reading your blood panelThe other numbers on the same reportWhich tests find the causeWhat each follow-up test looks forWhen low haemoglobin needs a haematologistThe signs that call for a blood specialist
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