How do you feel when your B12 is low?

Key points about vitamin B12 deficiency anemia Without enough red blood cells, your tissues and organs don't get enough oxygen. Without enough oxygen, your body can't work as well. Symptoms include weak muscles, numbness, trouble walking, nausea, weight loss, irritability, fatigue, and increased heart rate.

hopkinsmedicine.org - Vitamin B12 Deficiency Anemia | Johns Hopkins Medicine

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What is vitamin B12 deficiency anemia?

Vitamin B 12 deficiency anemia is a condition in which your body does not have enough healthy red blood cells, due to a lack (deficiency) of vitamin B 12. This vitamin is needed to make red blood cells, which carry oxygen to all parts of your body. Without enough red blood cells, your tissues and organs don’t get enough oxygen. Without enough oxygen, your body can’t work as well. Folic acid, also called folate, is another B vitamin. Anemias caused by a lack of vitamin B 12 or a lack of folate are 2 types of megaloblastic anemia. With these types of anemia, the red blood cells don’t develop normally. They are very large. And they are shaped like an oval, not round like healthy red blood cells. This causes the bone marrow to make fewer red blood cells. In some cases the red blood cells die sooner than normal.

What causes vitamin B12 deficiency anemia?

Vitamin B 12 deficiency anemia is more common in people whose families come from northern Europe. It is caused by one of the following: Lack of intrinsic factor. Intrinsic factor is a protein made in the stomach. It is needed to absorb vitamin B 12 . This type of B 12 deficiency anemia is called pernicious anemia. Intrinsic factor is a protein made in the stomach. It is needed to absorb vitamin B . This type of B deficiency anemia is called pernicious anemia. Surgery that removes or bypasses the end of the small intestine. This part of the small intestine is where vitamin B 12 is absorbed. The inability to make intrinsic factor may be caused by several things, such as:

Chronic gastritis

Surgery to remove all or part of the stomach (gastrectomy)

An autoimmune condition, where the body attacks its own tissues

Other types of megaloblastic anemia may be linked with type 1 diabetes, thyroid disease, and a family history of the disease. The inability to make intrinsic factor may be the result of several factors, such as chronic gastritis, gastrectomy (removal of all or part of the stomach), or an autoimmune condition (the body attacks its own tissues). Other types of megaloblastic anemia may be associated with type 1 diabetes, thyroid disease, and a family history of the disease.

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Who is at risk for vitamin B12 deficiency anemia?

Risk factors for vitamin B 12 deficiency anemia include:

A family history of the disease

Having part or all of your stomach or intestine removed

Autoimmune diseases, including type 1 diabetes

Crohn's disease

HIV

Some medicines

Strict vegetarian diets

Being an older adult

What are the symptoms of vitamin B12 deficiency anemia?

Each person’s symptoms may vary. Symptoms may include:

Weak muscles

Numb or tingling feeling in hands and feet

Trouble walking

Nausea

Decreased appetite

Weight loss

Irritability

Lack of energy or tiring easily (fatigue)

Diarrhea

Smooth and tender tongue

Fast heart rate

The symptoms of megaloblastic anemia may look like other blood conditions or health problems. Always see your healthcare provider for a diagnosis.

How is vitamin B12 deficiency anemia diagnosed?

This type of anemia is usually found during a medical exam through a routine blood test. Your healthcare provider will take your medical history and give you a physical exam. Your provider may give you additional blood tests. You may also have other evaluation procedures, such as a bone marrow biopsy.

How is vitamin B12 deficiency anemia treated?

Your healthcare provider will figure out the best treatment for you based on:

How old you are

Your overall health and medical history

How sick you are

How well you handle certain medicines, treatments, or therapies

If your condition is expected to get worse

Your opinion or preference

Vitamin B 12 deficiency anemia and folate deficiency anemia often occur together and can be hard to tell apart. Treatment may include vitamin B 12 shots (injections) and folic acid pills.

Foods that are rich in folic acid include the following:

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Orange juice

Oranges

Romaine lettuce

Spinach

Liver

Rice

Barley

Sprouts

Wheat germ

Soy beans

Green, leafy vegetables

Beans

Peanuts

Broccoli

Asparagus

Peas

Lentils

Chickpeas (garbanzo beans)

Foods that are rich in both folic acid and vitamin B 12 include the following:

Eggs

Meat

Poultry

Milk

Shellfish

Fortified cereals

Taking folic acid by mouth is more effective than eating foods rich in folic acid. Vitamin B 12 is not as well absorbed by mouth as per injection.

Living with vitamin B12 deficiency anemia

Depending on the cause of your vitamin B 12 deficiency, you may need to take vitamin B 12 supplements for the rest of your life. These may be pills or shots. This may seem difficult. But it will let you live a normal life without symptoms. If your deficiency is due to a restrictive diet, you may want to work with a nutritionist. He or she can help ensure that you get enough vitamin B 12 and other vitamins. Tell your healthcare provider about any symptoms and follow your treatment plan.

Key points about vitamin B12 deficiency anemia

With this condition, your body does not have enough healthy red blood cells, due to a lack (deficiency) of vitamin B

It is one of several types of megaloblastic anemia.

Without enough red blood cells, your tissues and organs don’t get enough oxygen. Without enough oxygen, your body can’t work as well. Symptoms include weak muscles, numbness, trouble walking, nausea, weight loss, irritability, fatigue, and increased heart rate. Treatment may include vitamin B 12 supplements. It is also important to eat a well-balanced diet. Tips to help you get the most from a visit to your healthcare provider:

hopkinsmedicine.org - Vitamin B12 Deficiency Anemia | Johns Hopkins Medicine

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