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Primary amyloidosis

Primary amyloidosis is a rare disorder in which abnormal proteins build up in tissues and organs. Clumps of the abnormal proteins are called amyloid deposits.

Causes

The cause of primary amyloidosis is not well understood. Genes may play a role.

The condition is related to abnormal and excess production of proteins. Clumps of abnormal proteins build up in certain organs. This makes it harder for the organs to work correctly.

Primary amyloidosis can lead to conditions that include:

Symptoms

Symptoms depend on the organs affected. This disease can affect many organs and tissues, including the tongue, intestines, skeletal and smooth muscles, nerves, skin, ligaments, heart, liver, spleen, and kidneys.

Symptoms may include any of the following:

  • Abnormal heart rhythm
  • Fatigue
  • Numbness of hands or feet
  • Shortness of breath
  • Skin changes
  • Swallowing problems
  • Swelling in the arms and legs
  • Swollen tongue
  • Weak hand grip
  • Weight loss or weight gain

Other symptoms that may occur with this disease:

Exams and Tests

The health care provider will examine you. You will be asked about your medical history and symptoms. A physical exam may show that you have a swollen liver or spleen, or signs of nerve damage.

The first step in diagnosing amyloidosis should be blood and urine tests to look for abnormal proteins.

Other tests depend on your symptoms and the organ that may be affected. Some tests include:

Tests that can help confirm the diagnosis include:

  • Abdominal fat pad aspiration
  • Bone marrow biopsy
  • Heart muscle biopsy
  • Rectal mucosa biopsy

Treatment

Treatment may include:

  • Chemotherapy
  • Stem cell transplant
  • Organ transplant

If the condition is caused by another disease, that disease should be aggressively treated. This may improve symptoms or slow the disease from getting worse. Complications such as heart failure, kidney failure, and other problems can sometimes be treated, when needed.

Outlook (Prognosis)

How well you do depends on which organs are affected. Heart and kidney involvement may lead to organ failure and death. Body-wide (systemic) amyloidosis can lead to death within 2 years.

When to Contact a Medical Professional

Call your provider if you have symptoms of this disease. Also call if you have been diagnosed with this disease and have:

  • Decreased urine
  • Difficulty breathing
  • Swelling of the ankles or other body parts that does not go away

Prevention

There is no known prevention for primary amyloidosis.

Alternative Names

Amyloidosis - primary; Immunoglobulin light chain amyloidosis; Primary systemic amyloidosis

References

Gertz MA, Buadi FK, Lacy MQ, Hayman SR. Immunoglobulin light-chain amyloidosis (primary amyloidosis). In: Hoffman R, Benz EJ, Silberstein LE, et al, eds. Hematology: Basic Principles and Practice. 7th ed. Philadelphia, PA: Elsevier; 2018:chap 88.

Hawkins PN. Amyloidosis. In: Hochberg MC, Gravallese EM, Silman AJ, Smolen JS, Weinblatt ME, Weisman MH, eds. Rheumatology. 7th ed. Philadelphia, PA: Elsevier; 2019:chap 177.

Review Date 1/10/2019

Updated by: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.