Anaemia can cause tiredness, dizziness, headaches, cold hands and feet, and shortness of breath, particularly with exertion. These symptoms are not specific enough to confirm anaemia. WHO describes diagnosis through blood haemoglobin concentrations interpreted against the appropriate thresholds. Iron deficiency is an important cause, but infections, inflammation, blood loss and inherited blood disorders can also be involved.
| Question | What the guidance says |
|---|---|
| Can tiredness confirm anaemia? | No, it is a non-specific symptom |
| What is measured? | Haemoglobin concentration in blood |
| Is anaemia always iron deficiency? | No, there are several possible causes |
| Who interprets the result? | A qualified health professional, with the person's clinical context |
The WHO anaemia fact sheet explains that haemoglobin helps carry oxygen to organs and tissues. Anaemia involves too few red blood cells or too little haemoglobin within them. This helps explain why reduced physical capacity can be part of the picture, but the explanation does not identify the cause in any individual reader.
What are common anaemia symptoms?
WHO lists feeling tired or light-headed, headaches and breathlessness among common symptoms. More serious anaemia can involve paleness of the skin or mucous membranes, faster breathing and heart rate, or dizziness on standing. A symptom list should help someone describe a concern to a clinician; it cannot replace an examination or a blood test.
For an appointment, describe what has changed in your daily life rather than simply labelling yourself anaemic. That might mean explaining when the tiredness began or which ordinary activity now leaves you unusually breathless. These are examples of how to communicate a symptom, not a scoring system or a way to decide your haemoglobin level at home.
There is also a difference between recognising a symptom and dismissing it as ordinary tiredness. WHO encourages people with symptoms to speak to a health care provider early. If you have an existing medical condition, consult a qualified doctor about symptoms and test results rather than relying on this general explanation.
Is anaemia the same as iron deficiency?
No. WHO's anaemia topic guidance identifies iron deficiency as the most common nutritional cause, while also naming deficiencies of folate and vitamins B12 and A. Nutritional problems can involve inadequate intake or difficulty absorbing nutrients. A low haemoglobin result therefore does not establish that a person simply needs more of one food.
The same guidance identifies infections, inflammation, chronic diseases, gynaecological and obstetric conditions, and inherited red blood cell disorders as other possible causes. These categories explain why assessment must go beyond the word anaemia on a report. A person can have a laboratory finding that still needs an explanation.
For Indian families, familiar terms such as thalassaemia may arise during that discussion. WHO includes inherited red cell conditions among causes, but their presence cannot be inferred from tiredness. A relative's history is information to share with the clinician, rather than a basis for deciding that two family members have the same condition.
How is a low haemoglobin result interpreted?
WHO's update on measurement and diagnosis stresses the need to measure haemoglobin accurately and understand underlying causes. It describes different thresholds across age, sex and physiological groups, with adjustments for factors such as elevation of residence and smoking. A single number copied from a general internet chart cannot capture all of that context.
This is why comparing your report with another person's report may not answer the question you have. The useful discussion is whether your value was interpreted using the relevant reference and circumstances, and what further assessment is appropriate. Bring the actual report, including its units and laboratory details, rather than relying on a remembered number.
WHO published its guideline on haemoglobin cutoffs on 5 March 2024. The publication addresses measurement and the use of haemoglobin concentrations in individuals and populations. Its stated aim is to improve diagnosis. That is more careful than treating every low result as interchangeable or using a population statistic to explain one person's symptoms.
Why do children and pregnancy need particular attention?
WHO identifies young children, menstruating adolescent girls and women, and pregnant and postpartum women as particularly affected groups. Its topic guidance links more severe anaemia with important maternal and child health consequences, including effects on development. These concerns support timely professional assessment; they do not justify self-prescribing a supplement or assuming the cause.
For broader nutrition literacy, our guides explain adult protein requirements, fibre in vegetarian meals, and how to read food labels. They offer background on eating patterns and labels. None establishes why a particular person has a low haemoglobin result.
