Iron Deficiency Anemia: Signs, Blood Tests and What to Do Next
Iron deficiency anemia happens when your body doesn’t have enough iron to make healthy red blood cells. Without enough of these cells, your body gets less oxygen. That is why you feel tired, weak, or breathless.
It is the most common type of anemia in the UK. The good news is that it is easy to test for and usually easy to treat.
Iron deficiency vs. iron deficiency anemia: what is the difference?
Many articles mix these two up. They are not the same.
- Iron deficiency means your iron stores are running low. Your blood count may still look normal.
- Iron deficiency anemia is the next stage. Your iron is so low that your red blood cells and hemoglobin drop.
Think of it like a fuel tank. First the spare tank empties. Then the engine starts to struggle. You can feel unwell at the first stage, before anemia shows up.
| Iron Deficiency Anemia | Iron deficiency | Iron deficiency anemia |
| Iron stores | Low | Very low or empty |
| Hemoglobin | Often normal | Low |
| Symptoms | Mild or none, sometimes tiredness | More noticeable: tiredness, breathlessness, paler skin |
| What the test shows | Low ferritin | Low ferritin and low hemoglobin |
Common signs of iron deficiency anemia
Many people have only one or two signs at first. They can build up slowly, so they are easy to ignore.
- Constant tiredness and low energy
- Shortness of breath, especially when you move
- A fast or noticeable heartbeat
- Paler skin than usual
- Headaches or dizziness
- Cold hands and feet
Some less common signs are easy to miss:
- Sore or smooth tongue
- Cracks at the corners of your mouth
- Food tasting strange
- Brittle or spoon-shaped nails
- Restless legs
- Cravings for non-food things like ice or paper
A note on skin tone: paleness is harder to spot on darker skin. Look inside your lower eyelid or at your gums, and pay more attention to tiredness and breathlessness.
Remember that all of these signs can have other causes. Only a blood test can confirm anemia.
Why do people get low iron?
Your body can run low for three main reasons.
- Not enough iron from food. This can happen with a very restricted diet, but meat eaters can be affected too.
- Losing blood. Heavy periods are a very common cause. Bleeding from the stomach or gut can also be a cause. Long-term use of painkillers like ibuprofen or aspirin can irritate the stomach and lead to slow bleeding.
- Needing more iron. Pregnancy is the best-known example, because your body makes extra blood.
Some people also struggle to absorb iron from food because of gut conditions. That is one reason a doctor looks for the cause, not just the low number.
What happens at the GP appointment?
Many people feel nervous about this step, so here is what to expect.
- Your GP will ask about your symptoms, diet, periods, and any medicines you take.
- You will have a simple blood test.
- The test checks your hemoglobin and red blood cells. Your doctor may also check ferritin, which shows how much iron you have stored.
- If the cause is not clear, you may have more tests.
Do not start high-dose iron tablets on your own first. Too much iron can cause problems, and taking it before testing can hide the real cause.
How is it treated?
Treatment depends on the cause. It usually includes:
- Iron tablets prescribed by your doctor. They can cause constipation, stomach upset, or dark stools. Tell your GP if they bother you, as there are other options.
- Iron-rich foods such as red meat, beans, lentils, eggs, dark leafy greens, and fortified cereals.
- Treating the cause, such as heavy periods or a stomach problem.
According to the NHS, adults need about 8.7 mg of iron a day. Women aged 19 to 49 need 14.8 mg.
Simple tips to absorb more iron:
- Add vitamin C, such as orange juice or peppers, to iron-rich meals.
- Keep tea and coffee away from meals, as they can block iron absorption.
- Take tablets exactly as your doctor advises.
Safety note: keep iron tablets away from children. An overdose can be very dangerous for a young child.
When should you get help quickly?
Book a GP appointment if you have symptoms that do not go away. See a doctor urgently if you have:
- Chest pain
- Severe breathlessness
- Fainting
- Black, sticky stools or blood in your stools
- Very heavy periods that soak through protection quickly
Older adults should not wait. Tiredness and paleness in later life should always be checked.
How long until you feel better?
Many people notice more energy within a few weeks of starting treatment. Your doctor will usually repeat blood tests to check that your levels are rising. Iron stores can take a few months to rebuild, so keep taking treatment for as long as you are told.
Frequently asked questions
Can you have iron deficiency without anemia?
Yes. Your iron stores can be low while your blood count is still normal. You may still feel tired.
What is the most common symptom?
Tiredness and lack of energy. Breathlessness, a fast heartbeat, and paler skin are also very common.
Can iron deficiency anemia go away on its own?
Rarely. Food alone may not fix it, and the cause needs to be found. See your GP.
Is it serious?
It is usually treatable. Left untreated, it can make you more likely to pick up infections and can strain your heart.
Can diet alone fix it?
Sometimes in mild cases. Many people also need iron tablets, and the cause must be treated.
Final Thoughts
Iron deficiency anemia is common but treatable. If you experience ongoing tiredness, breathlessness, or low energy, speak to your GP and get a blood test. Early diagnosis and the right treatment can help restore your iron levels and improve your overall health
