What happens if low iron goes untreated

Check if you have iron deficiency anaemia

Symptoms can include:

• tiredness and lack of energy
• shortness of breath
• noticeable heartbeats (heart palpitations)
• pale skin

Less common symptoms of iron deficiency anaemia (that are not usually connected to pregnancy) include:

• headaches
• hearing ringing, buzzing or hissing noises inside your head (tinnitus)
• food tasting strange
• feeling itchy
• a sore tongue
• hair loss – you notice more hair coming out when brushing or washing it
• wanting to eat non-food items, such as paper or ice (pica)
• finding it hard to swallow (dysphagia)
• painful open sores (ulcers) in the corners of your mouth
• spoon-shaped nails
• restless legs syndrome

Non-urgent advice: See a GP if you have symptoms of iron deficiency anaemia

A simple blood test will confirm if you have iron deficiency anaemia.

What happens at your appointment

The GP will ask you about your lifestyle and medical history.

If the reason for the anaemia is not clear, they might order some tests to find out what might be causing the symptoms.

They might also refer you to a specialist for further checks.

Blood tests for iron deficiency anaemia

The GP will usually order a full blood count (FBC) test. This will find out if the number of red blood cells you have (your red blood cell count) is normal.

You do not need to do anything to prepare for this test.

Iron deficiency anaemia is the most common type of anaemia. There are other types, like vitamin B12 and folate anaemia, that the blood test will also check for.

Treatment for iron deficiency anaemia

Once the reason you have anaemia has been found (for example, an ulcer or heavy periods) the GP will recommend treatment.

If the blood test shows your red blood cell count is low, iron tablets will be recommended to replace the iron that's missing from your body.

You’ll need to take them for about 6 months. Drinking orange juice after you've taken a tablet may help your body absorb the iron.

Follow the GP’s advice about how to take iron tablets.

Some people get side effects when taking iron tablets like:

• constipation or diarrhoea
• tummy pain
• heartburn
• feeling sick
• black poo

Try taking the tablets with or soon after food to reduce the chance of side effects.

It's important to keep taking the tablets, even if you get side effects.

Your GP may carry out repeat blood tests over the next few months to check that your iron level is getting back to normal.

Important

Keep iron supplement tablets out of the reach of children. An overdose of iron in a young child can be fatal.

Things you can do yourself

If your diet is partly causing your iron deficiency anaemia, your GP will tell you what foods are rich in iron so you can eat more of them.

Eat and drink more:

• dark-green leafy vegetables like watercress and curly kale
• cereals and bread with extra iron in them (fortified)
• meat
• dried fruit like apricots, prunes and raisins
• pulses (beans, peas and lentils)

Eat and drink less:

• tea
• coffee
• milk and dairy
• foods with high levels of phytic acid, such as wholegrain cereals, which can stop your body absorbing iron from other foods and pills

Large amounts of these foods and drinks make it harder for your body to absorb iron.

You might be referred to a specialist dietitian if you're finding it hard to include iron in your diet.

Causes of iron deficiency anaemia

In pregnancy, iron deficiency anaemia is most often caused by a lack of iron in your diet.

Heavy periods and pregnancy are very common causes of iron deficiency anaemia. Heavy periods can be treated with medicine.

For men and for women whose periods have stopped, bleeding in the stomach and intestines is the most common cause of iron deficiency anaemia. This can be caused by:

Iron-deficiency anemia means that your body does not have enough iron. Your body needs iron to help carry oxygen through your blood to all parts of your body. Iron-deficiency anemia affects more women than men and is more common during pregnancy.

What is iron-deficiency anemia?

Iron-deficiency anemia is the most common type of anemia, a condition that happens when your body does not make enough healthy red blood cells or the blood cells do not work correctly.

Iron-deficiency anemia happens when you don’t have enough iron in your body. Your body needs iron to make hemoglobin, the part of the red blood cell that carries oxygen through your blood to all parts of your body.

Who gets iron-deficiency anemia?

Iron-deficiency anemia affects more women than men. The risk of iron-deficiency anemia is highest for women who:

• Are pregnant. Iron-deficiency anemia affects one in six pregnant women.1 You need more iron during pregnancy to support your unborn baby’s development.
• Have heavy menstrual periods. Up to 5% of women of childbearing age develop iron-deficiency anemia because of heavy bleeding during their periods.2

Infants, small children, and teens are also at high risk for iron-deficiency anemia. Learn how much iron children need at different ages.

What are the symptoms of iron-deficiency anemia?

Iron-deficiency anemia often develops slowly. In the beginning, you may not have any symptoms, or they may be mild. As it gets worse, you may notice one or more of these symptoms:3

• Fatigue (very common)
• Weakness (very common)
• Dizziness
• Headaches
• Low body temperature
• Pale or yellow "sallow" skin
• Rapid or irregular heartbeat
• Shortness of breath or chest pain, especially with physical activity
• Brittle nails
• Pica (unusual cravings for ice, very cold drinks, or non-food items like dirt or paper)4

If you think you may have iron-deficiency anemia, talk to your doctor or nurse.

What causes iron-deficiency anemia?

Women can have low iron levels for several reasons:

• Iron lost through bleeding. Bleeding can cause you to lose more blood cells and iron than your body can replace. Women may have low iron levels from bleeding caused by:
  • Digestive system problems, such as ulcers, colon polyps, or colon cancer
  • Regular, long-term use of aspirin and other over-the-counter pain relievers
  • Donating blood too often or without enough time in between donations for your body to recover5
  • Heavier or longer than normal menstrual periods
  • Uterine fibroids, which are noncancerous growths in the uterus that can cause heavy bleeding
• Increased need for iron during pregnancy. During pregnancy, your body needs more iron than normal to support your developing baby.
• Not eating enough food that contains iron. Your body absorbs the iron in animal-based foods, such as meat, chicken, and fish, two to three times better than the iron in plant-based foods. Vegetarians or vegans, who eat little or no animal-based foods, need to choose other good sources of iron to make sure they get enough.6 Your body also absorbs iron from plant-based foods better when you eat them with foods that have vitamin C, such as oranges and tomatoes. But most people in the United States get enough iron from food.
• Problems absorbing iron. Certain health conditions, such as Crohn's disease or celiac disease, or gastric bypass surgery for weight loss can make it harder for your body to absorb iron from food.

How is iron-deficiency anemia diagnosed?

Talk to your doctor if you think you might have iron-deficiency anemia. Your doctor may:

• Ask you questions about your health history, including how regular or heavy your menstrual periods are. Your doctor may also ask you about any digestive system problems you may have, such as blood in your stool.
• Do a physical exam
• Talk to you about the foods you eat, the medicines you take, and your family health history
• Do blood tests. Your doctor will do a complete blood count (CBC). The CBC measures many parts of your blood. If the CBC test shows that you have anemia, your doctor will likely do another blood test to measure the iron levels in your blood and confirm that you have iron-deficiency anemia.  

If you have iron-deficiency anemia, your doctor may want to do other tests to find out what is causing it.

Do I need to be tested for iron-deficiency anemia?

Maybe. Talk to your doctor about getting tested as part of your regular health exam if you have heavy menstrual periods or a health problem such as Crohn's disease or celiac disease.

How is iron-deficiency anemia treated?

Treatment for iron-deficiency anemia depends on the cause:

• Blood loss from a digestive system problem. If you have an ulcer, your doctor may give you antibiotics or other medicine to treat the ulcer. If your bleeding is caused by a polyp or cancerous tumor, you may need surgery to remove it. 
• Blood loss from heavy menstrual periods. Your doctor may give you hormonal birth control to help relieve heavy periods. If your heavy bleeding does not get better, your doctor may recommend surgery. Types of surgery to control heavy bleeding include endometrial ablation, which removes or destroys your uterine lining, and hysterectomy, which removes all or parts of your uterus.
• Increased need for iron. If you have problems absorbing iron or have lower iron levels but do not have severe anemia, your doctor may recommend:
  • Iron pills to build up your iron levels as quickly as possible. Do not take any iron pills without first talking to your doctor or nurse.
  • Eating more foods that contain iron. Good sources of iron include meat, fish, eggs, beans, peas, and fortified foods (look for cereals fortified with 100% of the daily value for iron).
  • Eating more foods with vitamin C. Vitamin C helps your body absorb iron. Good sources of vitamin C include oranges, broccoli, and tomatoes.

If you have severe bleeding or symptoms of chest pain or shortness of breath, your doctor may recommend iron or red blood cell transfusions. Transfusions are for severe iron deficiencies only and are much less common.

What do I need to know about iron pills?

Your doctor may recommend iron pills to help build up your iron levels. Do not take these pills without talking to your doctor or nurse first. Taking iron pills can cause side effects, including an upset stomach, constipation, and diarrhea. If taken as a liquid, iron supplements may stain your teeth.

You can reduce side effects from iron pills by taking these steps:

• Start with half of the recommended dose. Gradually increase to the full dose.
• Take iron in divided doses. For example, if you take two pills daily, take one in the morning with breakfast and the other after dinner.
• Take iron with food (especially something with vitamin C, such as a glass of orange juice, to help your body absorb the iron).
• If one type of iron pill causes side effects, ask your doctor for another type.
• If you take iron as a liquid instead of as a pill, aim it toward the back of your mouth. This will prevent the liquid from staining your teeth. You can also brush your teeth after taking the medicine to help prevent staining.

What can happen if iron-deficiency anemia is not treated?

If left untreated, iron-deficiency anemia can cause serious health problems. Having too little oxygen in the body can damage organs. With anemia, the heart must work harder to make up for the lack of red blood cells or hemoglobin. This extra work can harm the heart.

Iron-deficiency anemia can also cause problems during pregnancy.

How can I prevent iron-deficiency anemia?

You can help prevent iron-deficiency anemia with the following steps:

• Treat the cause of blood loss. Talk to your doctor if you have heavy menstrual periods or if you have digestive system problems, such as frequent diarrhea or blood in your stool.
• Eat foods with iron. Good sources of iron include lean meat and chicken, dark, leafy vegetables, and beans.
• Eat and drink foods that help your body absorb iron, like orange juice, strawberries, broccoli, or other fruits and vegetables with vitamin C.
• Make healthy food choices. Most people who make healthy, balanced food choices get the iron and vitamins their bodies need from the foods they eat.
• Avoid drinking coffee or tea with meals. These drinks make it harder for your body to absorb iron.
• Talk to your doctor if you take calcium pills. Calcium can make it harder for your body to absorb iron. If you have a hard time getting enough iron, talk to your doctor about the best way to also get enough calcium.

How much iron do I need every day?

The chart below lists how much iron you need every day. The recommended amounts are listed in milligrams (mg). See a list of good sources of iron.

Age

Women

Pregnant women

Breastfeeding women

Vegetarian women*

14–18 years

15 mg

27 mg

10 mg

27 mg

19–50 years

18 mg

27 mg

9 mg

32 mg

51+ years

8 mg

n/a

n/a

14 mg

Source: Adapted from Institute of Medicine, Food and Nutrition Board6

*Vegetarians need more iron from food than people who eat meat do. This is because the body can absorb iron from meat better than from plant-based foods.

What foods contain iron?

Food sources of iron include:

• Fortified breakfast cereals (18 milligrams per serving)
• Oysters (8 milligrams per 3-ounce serving)
• Canned white beans (8 milligrams per cup)
• Dark chocolate (7 milligrams per 3-ounce serving)
• Beef liver (5 milligrams per 3-ounce serving)
• Spinach (3 milligrams per ½ cup)
• Tofu, firm (3 milligrams per ½ cup)
• Kidney beans (2 milligrams per ½ cup)
• Canned tomatoes (2 milligrams per ½ cup)
• Lean beef (2 milligrams for a 3-ounce serving)
• Baked potato (2 milligrams for a medium potato)

Find more sources of iron.

Do I need more iron during pregnancy?

Yes. During pregnancy, your body needs more iron to support your growing baby. In fact, pregnant women need almost twice as much iron as women who are not pregnant do. Not getting enough iron during pregnancy raises your risk for premature birth or a low-birth-weight baby (less than 5 ½ pounds). Premature birth is the most common cause of infant death. Both premature birth and low birth weight raise your baby's risk for health and developmental problems at birth and during childhood.

If you're pregnant, talk to your doctor about these steps:

• Getting 27 milligrams of iron every day. Take a prenatal vitamin with iron every day, or talk to your doctor about taking an iron supplement (pill).
• Testing for iron-deficiency anemia7
• Testing for iron-deficiency anemia four to six weeks after childbirth

Do I need more iron if I am breastfeeding?

No, you do not need more iron during breastfeeding. In fact, you need less iron than before you were pregnant. The amount of iron women need during breastfeeding is 10 milligrams per day for young mothers 14 to 18 and 9 milligrams per day for breastfeeding women older than 18.

You need less iron while breastfeeding because you likely will not lose a lot through your menstrual cycle. Many breastfeeding women do not have a period or may have only a light period. Also, if you got enough iron during pregnancy (27 milligrams a day), your breastmilk will supply enough iron for your baby.

Does menopausal hormone therapy affect how much iron I need to take?

It might. If you still get your period and take menopausal hormone therapy, you may need more iron than women who are postmenopausal and do not take menopausal hormone therapy. Talk to your doctor or nurse.

Does birth control affect my risk for iron-deficiency anemia?

It could. Hormonal birth control, such as the pill, the patch, the shot, or the hormonal intrauterine device (IUD), is often used to treat women with heavy menstrual periods. Lighter menstrual periods may reduce your risk for iron-deficiency anemia.

Also, the non-hormonal, copper IUD (Paragard) may make your menstrual flow heavier. This raises your risk for iron-deficiency anemia.

Talk to your doctor or nurse about your risk for anemia and whether hormonal birth control may help.

I am a vegetarian. How can I make sure I get enough iron?

You can help make sure you get enough iron by choosing foods that contain iron more often. Vegetarians need more iron from food than people who eat meat. This is because the body can absorb iron from meat better than from plant-based foods.

Vegetarian sources of iron include:8

• Cereals and bread with added iron
• Lentils and beans
• Dark chocolate
• Dark green leafy vegetables, such as spinach and broccoli
• Tofu
• Chickpeas
• Canned tomatoes

Talk to your doctor or nurse about whether you get enough iron. Most people get enough iron from food.

Can I get more iron than my body needs?

Yes, your body can get too much iron. Extra iron can damage the liver, heart, and pancreas. Try to get no more than 45 milligrams of iron a day, unless your doctor prescribes more.

Some people get too much iron because of a condition called hemochromatosis that runs in families. Learn more about hemochromatosis, who is at risk, and how it is treated.

You can also get too much iron from iron pills (if you also get iron from food) or from repeated blood transfusions.

Did we answer your question about iron-deficiency anemia?

For more information about iron-deficiency anemia, call the OWH Helpline at 1-800-994-9662 or contact the following organizations:

What happens if you have low iron for too long?

What happens if you have low iron and don't treat it?

Can you survive with low iron?

Can low iron become an emergency?