Anemia means your blood has too little hemoglobin, the iron-rich protein in red blood cells that carries oxygen around the body. It is one of the most common health problems in India: the National Family Health Survey (NFHS-5) found anemia in about 57% of women aged 15 to 49 and 67% of children under five. The good news is that most anemia is easy to test for and, once the cause is found, very treatable.
Quick answer: Anemia is diagnosed with a simple blood test. For adults, hemoglobin below 13 g/dL in men and below 12 g/dL in non-pregnant women counts as anemia. Common symptoms are tiredness, breathlessness on exertion, pale skin and dizziness. Iron deficiency is the most frequent cause, but vitamin B12 or folate deficiency, blood loss, infections such as malaria, and inherited conditions like thalassemia and sickle cell disease can also cause it, so the cause should be confirmed before treatment.
Key takeaways
- ✅ A complete blood count (CBC) is the first test, and it is inexpensive.
- ✅ Iron tablets help iron deficiency, but not thalassemia or B12 deficiency, so find the cause first.
- ✅ Pregnant women, adolescent girls and young children are at highest risk.
- ✅ Iron-rich food with vitamin C, and avoiding tea with meals, improves iron absorption.
Symptoms of anemia
Mild anemia may cause no symptoms at all and is often found on a routine test. As it gets worse, you may notice:
- Tiredness, weakness and low stamina
- Breathlessness when climbing stairs or walking fast
- Pale skin, pale inner eyelids, nail beds or palms
- Dizziness, headaches or a fast, pounding heartbeat
- Cold hands and feet, and poor concentration
- With iron deficiency: brittle or spoon-shaped nails, hair fall, sore tongue, and craving to eat ice, mud or chalk (pica)
- With B12 deficiency: tingling or numbness in the hands and feet, and memory problems
- In children: poor appetite, irritability, slow growth and difficulty concentrating at school
See a doctor urgently if anemia comes with chest pain, fainting, breathlessness at rest, black or bloody stools, vomiting blood or very heavy periods. These can mean severe anemia or active bleeding.
Hemoglobin levels that define anemia
The World Health Organization's 2024 guideline sets these hemoglobin cutoffs. Values below them mean anemia.
| Group |
Anemia if hemoglobin is below |
| Children 6 to 23 months | 10.5 g/dL |
| Children 2 to 4 years | 11.0 g/dL |
| Children 5 to 11 years | 11.5 g/dL |
| Adolescents 12 to 14 years | 12.0 g/dL |
| Non-pregnant women (15 years and above) | 12.0 g/dL |
| Men (15 years and above) | 13.0 g/dL |
| Pregnant women, first and third trimester | 11.0 g/dL |
| Pregnant women, second trimester | 10.5 g/dL |
For adults who are not pregnant, anemia is usually graded as mild (11.0 g/dL up to the cutoff), moderate (8.0 to 10.9 g/dL) or severe (below 8.0 g/dL). In pregnancy and in young children, severe anemia is below 7.0 g/dL. Lab reference ranges can differ slightly, so always read your result with your doctor.
Types and causes of anemia
| Type |
Common causes |
Typical blood picture |
| Iron deficiency anemia | Low dietary iron, heavy periods, pregnancy, worm infestation, bleeding from the gut (ulcers, piles, cancer), frequent blood donation | Small, pale red cells (low MCV), low ferritin |
| Vitamin B12 or folate deficiency | Strict vegetarian diet without B12 sources, poor absorption, long-term metformin or antacid use, alcohol | Large red cells (high MCV) |
| Thalassemia | Inherited problem making normal hemoglobin. Thalassemia trait (carrier) is common in India and usually causes only mild anemia. | Small red cells with normal or high iron; confirmed by HbA2 test (HPLC) |
| Sickle cell disease | Inherited; more common in parts of central, western and southern India and in some tribal communities | Sickle-shaped cells; confirmed by solubility test or HPLC |
| Anemia of chronic disease | Kidney disease, long-standing infections such as tuberculosis, rheumatoid arthritis, cancer | Normal-sized cells, ferritin normal or high |
| Hemolytic anemia | Red cells break down early: malaria, G6PD deficiency after certain medicines, autoimmune disease | Raised reticulocytes and bilirubin |
| Aplastic anemia | Bone marrow stops making enough cells; rare | Low red cells, white cells and platelets together |
Tests for anemia
- Complete blood count (CBC): hemoglobin, red cell count, and red cell indices such as MCV and MCH, which point to the likely type.
- Peripheral blood smear: a look at the shape and size of red cells under the microscope.
- Serum ferritin and iron studies: confirm iron deficiency. Low ferritin is the most reliable sign.
- Vitamin B12 and folate levels when the red cells are large.
- Hemoglobin electrophoresis or HPLC to check for thalassemia trait or sickle cell disease, which is especially useful before marriage or in early pregnancy.
- Reticulocyte count to see whether the bone marrow is responding.
- Stool tests for hidden blood or worms, and other tests as needed to find a source of blood loss.
Treatment of anemia
Treatment depends on the cause, which is why testing comes first.
- Iron deficiency: iron tablets, usually for about three months after hemoglobin returns to normal to rebuild iron stores. Taking them on alternate days or once daily can reduce stomach upset. Hemoglobin should start rising within 2 to 4 weeks. Iron given by drip (intravenous iron) is used when tablets are not tolerated, do not work, or in later pregnancy with significant anemia. The underlying cause, such as heavy periods or worms, must also be treated.
- B12 deficiency: B12 injections or high-dose tablets, depending on the cause. Folate deficiency: folic acid tablets.
- Thalassemia trait: usually needs no treatment, and iron should not be taken unless iron deficiency is also proven. Thalassemia major and sickle cell disease need specialist care.
- Severe anemia: may need a blood transfusion in hospital.
Under India's Anemia Mukt Bharat programme, iron and folic acid supplements are given free to children, adolescents, and pregnant and breastfeeding women through schools, anganwadis and health centres, along with regular deworming.
Foods that help
- Iron-rich foods: green leafy vegetables, legumes and dals, chana, rajma, ragi, dates, jaggery in moderation, eggs, fish, chicken and liver
- Add vitamin C (amla, lemon, guava, oranges, tomatoes) to meals to boost absorption of plant iron
- Keep tea and coffee at least an hour away from meals and iron tablets
- For B12: milk, curd, paneer, eggs, fish and meat, or supplements for strict vegetarians and vegans
See our full list of top iron-rich foods for practical meal ideas.
Frequently asked questions
What is a normal hemoglobin level?
For most labs, about 13 to 17 g/dL for adult men and 12 to 15 g/dL for adult women. Check the reference range printed on your own report.
How long does it take to recover from iron deficiency anemia?
Energy often improves within a few weeks, and hemoglobin usually returns to normal in about two to three months of regular treatment. Stores take longer to refill.
Can anemia be dangerous?
Yes, if it is severe or untreated. It strains the heart, lowers immunity and, in pregnancy, raises the risk of premature birth, low birth weight and complications during delivery.
Should I take iron tablets on my own?
It is better to test first. Iron does not help other types of anemia and can build up harmfully in people with thalassemia or iron overload, and ongoing blood loss needs to be found.
Last updated: September 2026. General health information only, not a diagnosis or a treatment plan. Please discuss your blood test results and any supplements with a qualified doctor.
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