Anaemia iron deficiency living in teenagers

Overview

Iron-deficiency anaemia in teenagers means your body doesn't have enough iron to make healthy red blood cells. These cells carry oxygen around your body, so without enough iron, you may feel tired, weak, or short of breath.

Iron-deficiency anaemia is one of the most common nutritional problems in teenagers, especially in girls. Up to 1 in 10 teenage girls may have it.

It can affect any teenager, but it is more common in girls who have heavy periods, teens who follow a vegetarian or vegan diet without enough iron, and those who are growing rapidly.

Symptoms

Common symptoms

• Feeling very tired or lacking energy
• Pale skin or looking pale inside the lower eyelids
• Shortness of breath, even with light activity
• Dizziness or light-headedness
• Cold hands and feet
• Brittle nails or hair loss
• Restless legs or a tingling feeling in the legs

Symptoms in children

• Poor appetite or slow growth
• Irritability or fussiness
• Difficulty concentrating in school

Symptoms in older adults

• This is not relevant for teenagers; for older adults, symptoms may include confusion or worsening of other health conditions.

Causes

Main causes

• Not getting enough iron from food – common in picky eaters, vegetarians, or vegans
• Blood loss – heavy periods in girls, or bleeding in the stomach or intestines
• Poor absorption of iron – due to conditions like coeliac disease or after stomach surgery

Risk factors

• Being a teenage girl with heavy periods
• Following a vegetarian or vegan diet without planning for iron-rich foods
• Rapid growth spurts that increase iron needs
• Playing intense sports that cause small amounts of blood loss (like runner's stomach)
• Having a chronic illness that affects iron absorption or causes inflammation

When to see a doctor

See a doctor urgently if:

• If you have chest pain, shortness of breath, or feel like you might faint – call emergency services immediately.
• If your symptoms are getting worse quickly – see a doctor the same day.

Book a routine appointment if:

• If you feel tired, pale, or weak for more than a few weeks
• If you have heavy periods or notice blood in your stool (poo)
• If you are a vegetarian or vegan and worried about your iron levels

Diagnosis

Your doctor will ask about your symptoms, diet, and periods (if applicable), and do a blood test to check your iron levels and haemoglobin.

Tests that may be done

• Full blood count – measures red blood cells and haemoglobin
• Serum ferritin – checks iron stores in your body
• Iron studies – tests how much iron is in your blood and how well it is being used

What to expect at your appointment

The blood test is quick and simple. Your doctor might also ask about your diet and any other symptoms. If results show low iron, they will talk to you about treatment and follow-up tests if needed.

Treatment

Treatment for iron-deficiency anaemia focuses on boosting your iron levels and fixing the underlying cause. Most teenagers can be treated with diet changes and oral iron supplements, but always follow your doctor's advice.

Self-care at home

• Eat more iron-rich foods like lean red meat, poultry, fish, beans, lentils, spinach, fortified breakfast cereals, and dried fruit
• Combine iron-rich foods with vitamin C (e.g., a glass of orange juice, strawberries, or peppers) to help your body absorb more iron
• Avoid drinking tea or coffee with meals – they can reduce iron absorption
• If you are vegetarian or vegan, talk to a dietitian about how to get enough iron from plant foods

Medical treatments

If diet changes are not enough, your doctor may recommend iron supplements (usually tablets or liquid) for several months. They will tell you the right dose and how to take them to avoid side effects like stomach upset or constipation. In rare cases where anaemia is severe or does not improve, a doctor may give iron through a drip (intravenous iron).

When is surgery considered?

Surgery is not usually needed for iron-deficiency anaemia unless there is a cause like a bleeding ulcer or other condition that requires surgical repair. This is very rare in teenagers.

Living with this condition

Living with iron-deficiency anaemia means you may need to be more careful about your diet and take supplements as prescribed. Once your iron levels are back to normal, most people feel much better within a few weeks to months.

Lifestyle tips

• Plan meals that include iron-rich foods every day
• Keep a food diary to track your iron intake if needed
• Get enough sleep and rest – your body needs energy to make new red blood cells
• Tell your school nurse or sports coach if you are being treated for anaemia, especially if you play sports

Diet and exercise

Eat a balanced diet with plenty of iron and vitamin C. Gentle exercise like walking or light jogging can help your energy levels, but avoid overdoing it until your iron is back to normal. Listen to your body and rest when you need to.

Mental health and emotional wellbeing

Feeling tired and weak all the time can affect your mood, schoolwork, and social life. It is normal to feel frustrated or worried. Talking to a trusted adult, school counsellor, or your doctor can help. Treating the anaemia often improves your energy and mood.

Prevention

In many cases, yes. Eating a balanced diet with enough iron, especially during growth spurts and after starting periods, can help prevent iron-deficiency anaemia. If you are at higher risk, regular check-ups with your doctor can catch low iron early.

Screening programmes

There is no routine screening for all teenagers, but if you have heavy periods or other risk factors, your doctor may check your iron levels at your annual check-up or when you have symptoms.

Complications

If left untreated

• Long-term tiredness and poor concentration affecting school and daily life
• Increased risk of infections
• Heart problems like an enlarged heart or irregular heartbeat (rare, but serious)
• Slower growth and development if it goes on for a long time

Long-term outlook

The outlook for teenagers with iron-deficiency anaemia is excellent. With proper treatment – diet changes, supplements, and addressing the cause – most people feel better within a few months. It is a common, treatable condition, and you can expect to get back to full health.

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