Pernicious Anaemia: Diagnosis and Treatment

Written by Medicover Team and Medically Reviewed by Dr Nilesh Wasekar , Hematologists

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Pernicious anaemia is a condition that occurs when the body cannot absorb enough vitamin B12, an essential nutrient required for healthy red blood cell production and proper nerve function. It is most commonly caused by the absence of intrinsic factor, a protein produced in the stomach that helps absorb vitamin B12. Without adequate vitamin B12, the body produces fewer healthy red blood cells, leading to anaemia and neurological complications if left untreated. Early diagnosis and lifelong vitamin B12 replacement therapy can effectively manage the condition and prevent serious complications.

What are the Types of Pernicious Anaemia?

Pernicious anaemia can be classified based on its underlying cause. The most common forms include autoimmune and non-autoimmune types.

Autoimmune Pernicious Anaemia: The immune system attacks the stomach's parietal cells or intrinsic factor, preventing proper absorption of vitamin B12.
Juvenile Pernicious Anaemia: A rare inherited form that develops during childhood due to genetic defects affecting intrinsic factor production.
Post-Surgical Pernicious Anaemia: Develops after stomach surgery that removes or damages the areas responsible for producing intrinsic factor, leading to poor vitamin B12 absorption.

What are the Symptoms of Pernicious Anaemia?

The symptoms of pernicious anaemia develop gradually and may affect both the blood and nervous system. Without treatment, symptoms can become progressively worse.

Persistent fatigue and weakness.
Pale or yellowish skin.
Shortness of breath during physical activity.
Dizziness or lightheadedness.
Heart palpitations.
Numbness or tingling in the hands and feet.
Muscle weakness or difficulty walking.
Sore, smooth, or swollen tongue.
Memory problems, confusion, or difficulty concentrating.
Difficulty with balance and coordination.

What are the Causes of Pernicious Anaemia?

Pernicious anaemia develops when the body is unable to absorb vitamin B12 because of a deficiency of intrinsic factor. Several autoimmune, genetic, and medical conditions can contribute to its development.

Autoimmune Disease: The immune system attacks the stomach cells that produce intrinsic factor, preventing vitamin B12 absorption.
Chronic Gastritis: Long-term inflammation of the stomach lining damages parietal cells responsible for producing intrinsic factor.
Gastric Surgery: Removal of part or all of the stomach can reduce intrinsic factor production and vitamin B12 absorption.
Genetic Factors: A family history of pernicious anaemia may increase the risk of developing the condition.
Associated Autoimmune Disorders: Conditions such as autoimmune thyroid disease or type 1 diabetes may increase the likelihood of pernicious anaemia.

When to see a Doctor for Pernicious Anaemia?

If you experience persistent fatigue, weakness, pale skin, numbness or tingling in your hands and feet, memory problems, or unexplained weight loss, consult a Hematologist for a comprehensive evaluation. Early diagnosis and vitamin B12 replacement therapy can prevent permanent nerve damage and other serious complications. Seek immediate medical attention if you develop severe shortness of breath, chest pain, difficulty walking, confusion, or symptoms of significant anemia.

Persistent fatigue, weakness, or lack of energy.
Pale or yellowish skin.
Numbness, tingling, or burning sensations in the hands or feet.
Difficulty walking, poor balance, or muscle weakness.
Memory problems, confusion, or difficulty concentrating.
Sore, red tongue or mouth ulcers.
Shortness of breath, dizziness, or rapid heartbeat.
Unexplained weight loss or poor appetite.
A personal or family history of autoimmune disorders or vitamin B12 deficiency.
Severe chest pain, fainting, difficulty breathing, worsening neurological symptoms, or signs of severe anemia requiring emergency medical care.

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How is Pernicious Anaemia Diagnosed?

Pernicious anaemia is diagnosed through a combination of blood tests, antibody testing, and other investigations to determine the cause of vitamin B12 deficiency. Early diagnosis is essential to prevent long-term complications, particularly nerve damage.

Blood Tests: Measure red blood cell count, haemoglobin, vitamin B12 levels, and folate levels to detect anaemia and vitamin deficiencies.
Intrinsic Factor Antibody Test: Detects antibodies against intrinsic factor, helping confirm autoimmune pernicious anaemia.
Bone Marrow Examination: In selected cases, a bone marrow biopsy may be performed to evaluate abnormal red blood cell production.
Schilling Test: Although rarely used today, this test evaluates the body's ability to absorb vitamin B12.
Upper Gastrointestinal Endoscopy: May be recommended to identify chronic gastritis, gastric atrophy, or other stomach abnormalities contributing to vitamin B12 deficiency.

What are the Treatment Options for Pernicious Anaemia?

Treatment for pernicious anaemia focuses on replacing vitamin B12, correcting anaemia, preventing neurological complications, and managing the underlying cause. Most patients require lifelong treatment.

Vitamin B12 Injections: Intramuscular vitamin B12 injections are the standard treatment and rapidly restore vitamin B12 levels.
Oral Vitamin B12 Supplements: High-dose oral vitamin B12 supplements may be prescribed for selected patients under medical supervision.
Dietary Modifications: Eating foods rich in vitamin B12, including meat, fish, eggs, dairy products, and fortified cereals, supports overall nutritional health, although diet alone cannot correct pernicious anaemia.
Regular Monitoring: Periodic blood tests and follow-up appointments help monitor vitamin B12 levels, blood counts, and treatment response.

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What are the Risk Factors for Pernicious Anaemia?

Several factors increase the likelihood of developing pernicious anaemia, particularly those that affect vitamin B12 absorption or are associated with autoimmune diseases.

Family History: Having close relatives with pernicious anaemia increases the risk.
Autoimmune Disorders: Conditions such as Hashimoto's thyroiditis, type 1 diabetes, and other autoimmune diseases are commonly associated.
Chronic Gastritis: Long-term inflammation of the stomach lining, including infection with Helicobacter pylori, may contribute to the condition.
Previous Gastrointestinal Surgery: Procedures such as gastrectomy or gastric bypass surgery can reduce vitamin B12 absorption.
Older Age: The risk increases after the age of 60 because vitamin B12 absorption naturally declines with age.
Vitamin B12 Deficiency: Long-standing vitamin B12 deficiency from any cause may increase the risk of developing complications.
Ethnicity: Individuals of Northern European or African ancestry have a slightly higher reported risk of developing pernicious anaemia.

Frequently Asked Questions

1. How do I recognize the signs of pernicious anaemia?

Look for symptoms like fatigue, pale skin, weakness, numbness/tingling in hands and feet, difficulty walking, memory loss, and sore tongue.

2. What precautions should be taken for pernicious anaemia?

Regular vitamin B12 injections, lifelong supplementation, monitoring for symptoms, and annual blood tests are crucial for managing pernicious anaemia.

3. How can pernicious anaemia affect the body in the long term?

Untreated pernicious anaemia can lead to nerve damage, cognitive issues, and an increased risk of developing stomach cancer.

4. What steps should I take for the management of pernicious anaemia?

Treatment involves lifelong vitamin B12 supplementation through injections or high-dose oral supplements to correct the deficiency and prevent complications.