Overview
Anemia is a condition in which you lack enough healthy red blood cells to carry adequate oxygen to your body's tissues. Having anemia can make you feel tired and weak.
There are many forms of anemia, each with its own cause. Anemia can be temporary or long term, and it can range from mild to severe. See your doctor if you suspect that you have anemia. It can be a warning sign of serious illness.
Treatments for anemia range from taking supplements to undergoing medical procedures. You might be able to prevent some types of anemia by eating a healthy, varied diet.
Symptoms
Anemia signs and symptoms vary depending on the cause. If the anemia is caused by a chronic disease, the disease can mask them, so that the anemia might be detected by tests for another condition.
Depending on the causes of your anemia, you might have no symptoms. Signs and symptoms, if they do occur, might include:
Fatigue
Weakness
Pale or yellowish skin
Irregular heartbeats
Shortness of breath
Dizziness or lightheadedness
Chest pain
Cold hands and feet
Headaches
At first, anemia can be so mild that you don't notice it. But symptoms worsen as anemia worsens.
When to see a doctor
Make an appointment with your doctor if you're feeling fatigued and you don't know why.
Fatigue has many causes besides anemia, so don't assume that if you're tired you must be anemic. Some people learn that their hemoglobin is low, which indicates anemia, when they donate blood. If you're told that you can't donate because of low hemoglobin, make an appointment with your doctor.
Causes
Anemia occurs when your blood doesn't have enough red blood cells.
This can happen if:
- Your body doesn't make enough red blood cells
- Bleeding causes you to lose red blood cells more quickly than they can be replaced
- Your body destroys red blood cells
What red blood cells do
Your body makes three types of blood cells — white blood cells to fight infection, platelets to help your blood clot and red blood cells to carry oxygen throughout your body.
Red blood cells contain hemoglobin — an iron-rich protein that gives blood its red color. Hemoglobin enables red blood cells to carry oxygen from your lungs to all parts of your body and to carry carbon dioxide from other parts of the body to your lungs to be exhaled.
Most blood cells, including red blood cells, are produced regularly in your bone marrow — a spongy material found within the cavities of many of your large bones. To produce hemoglobin and red blood cells, your body needs iron, vitamin B-12, folate and other nutrients from the foods you eat.
Causes of anemia
Different types of anemia have different causes. They include:
- Iron deficiency anemia. This most common type of anemia is caused by a shortage of iron in your body. Your bone marrow needs iron to make hemoglobin. Without adequate iron, your body can't produce enough hemoglobin for red blood cells.
- Vitamin deficiency anemia. Besides iron, your body needs folate and vitamin B-12 to produce enough healthy red blood cells. A diet lacking in these and other key nutrients can cause decreased red blood cell production.
Also, some people who consume enough B-12 aren't able to absorb the vitamin. This can lead to vitamin deficiency anemia, also known as pernicious anemia.
- Anemia of inflammation. Certain diseases — such as cancer, HIV/AIDS, rheumatoid arthritis, kidney disease, Crohn's disease and other acute or chronic inflammatory diseases — can interfere with the production of red blood cells.
- Aplastic anemia. This rare, life-threatening anemia occurs when your body doesn't produce enough red blood cells. Causes of aplastic anemia include infections, certain medicines, autoimmune diseases and exposure to toxic chemicals.
- Anemias associated with bone marrow disease. A variety of diseases, such as leukemia and myelofibrosis, can cause anemia by affecting blood production in your bone marrow. The effects of these types of cancer and cancer-like disorders vary from mild to life-threatening.
- Hemolytic anemias. This group of anemias develops when red blood cells are destroyed faster than bone marrow can replace them. Certain blood diseases increase red blood cell destruction. You can inherit a hemolytic anemia, or you can develop it later in life.
- Sickle cell anemia. This inherited and sometimes serious condition is a hemolytic anemia. It's caused by a defective form of hemoglobin that forces red blood cells to assume an abnormal crescent (sickle) shape. These irregular blood cells die prematurely, resulting in a chronic shortage of red blood cells.
Risk factors
These factors place you at increased risk of anemia:
- A diet lacking in certain vitamins and minerals. A diet consistently low in iron, vitamin B-12 and folate increases your risk of anemia.
- Intestinal disorders. Having an intestinal disorder that affects the absorption of nutrients in your small intestine — such as Crohn's disease and celiac disease — puts you at risk of anemia.
- Menstruation. In general, women who haven't had menopause have a greater risk of iron deficiency anemia than do men and postmenopausal women. Menstruation causes the loss of red blood cells.
- Pregnancy. If you're pregnant and aren't taking a multivitamin with folic acid and iron, you're at an increased risk of anemia.
- Chronic conditions. If you have cancer, kidney failure, diabetes or another chronic condition, you could be at risk of anemia of chronic disease. These conditions can lead to a shortage of red blood cells.
- Family history. If your family has a history of an inherited anemia, such as sickle cell anemia, you also might be at increased risk of the condition.
- Other factors. A history of certain infections, blood diseases and autoimmune disorders increases your risk of anemia. Alcoholism, exposure to toxic chemicals, and the use of some medications can affect red blood cell production and lead to anemia.
- Age. People over age 65 are at increased risk of anemia.
Complications
Left untreated, anemia can cause many health problems, such as:
- Severe fatigue. Severe anemia can make you so tired that you can't complete everyday tasks.
- Pregnancy complications. Pregnant women with folate deficiency anemia may be more likely to have complications, such as premature birth.
- Heart problems. Anemia can lead to a rapid or irregular heartbeat (arrhythmia). When you're anemic your heart must pump more blood to make up for the lack of oxygen in the blood. This can lead to an enlarged heart or heart failure.
- Death. Some inherited anemias, such as sickle cell anemia, can lead to life-threatening complications. Losing a lot of blood quickly results in acute, severe anemia and can be fatal.
Prevention
Many types of anemia can't be prevented. But you can avoid iron deficiency anemia and vitamin deficiency anemias by eating a diet that includes a variety of vitamins and minerals, including:
- Iron. Iron-rich foods include beef and other meats, beans, lentils, iron-fortified cereals, dark green leafy vegetables, and dried fruit.
- Folate. This nutrient, and its synthetic form folic acid, can be found in fruits and fruit juices, dark green leafy vegetables, green peas, kidney beans, peanuts, and enriched grain products, such as bread, cereal, pasta and rice.
- Vitamin B-12. Foods rich in vitamin B-12 include meat, dairy products, and fortified cereal and soy products.
- Vitamin C. Foods rich in vitamin C include citrus fruits and juices, peppers, broccoli, tomatoes, melons and strawberries. These also help increase iron absorption.
If you're concerned about getting enough vitamins and minerals from food, ask your doctor whether a multivitamin might help.
frequently asked questions
Is anemia a hereditary condition?
Is anemia a hereditary condition?
Yes, anemia can be caused by inherited diseases. Depending on the degree of the genetic disease, hereditary anemia can range from moderate to severe. Anemia can be caused by hereditary diseases that interfere with the production of hemoglobin.
What are the health risks of anemia?
What are the health risks of anemia?
Reduced oxygen levels in the body tissues are caused by low hemoglobin levels in the blood. This can lead to hypoxia, a condition in which the body's oxygen levels are insufficient to operate correctly.
How is anemia treated in children?
How is anemia treated in children?
It is critical to address the source of anemia in children. In the case of iron deficiency anemia, this may involve adopting new food choices and maybe prescribing an iron supplement if your healthcare practitioner believes it is necessary. Iron supplements for children are available in both liquid and pill forms.
What is a healthy level of iron in the body?
What is a healthy level of iron in the body?
Iron is mostly stored in your body’s red blood cells and muscles. You should have around 3000 mg of iron in your body at any one time.
