Amyloidosis Symptoms: Causes & Treatment in Canada

Amyloidosis symptoms can be difficult to recognize early, but catching them in time can make a life-saving difference. Amyloidosis is a group of rare but serious diseases caused by the build-up of abnormal proteins called amyloid in your body’s tissues and organs. These misfolded proteins clump together and collect outside of cells, where they slowly damage the organs around them, including the kidneys, heart, liver, spleen, and nervous system.

Recognizing Amyloidosis Symptoms Early

Understanding the causes and treatment options for amyloidosis is essential for Canadians who may be at risk. Because amyloid protein buildup happens gradually, many people don’t notice anything is wrong until significant organ damage has already occurred. That’s why learning to spot the early warning signs — and knowing when to talk to your doctor — can dramatically improve outcomes for those living with this condition in Canada.

What Is Amyloidosis?

Common Amyloidosis Symptoms by Body System and Severity

Body System Affected	Amyloidosis Symptoms	Description	Typical Severity
Heart	Shortness of breath, irregular heartbeat, fatigue	Amyloid protein deposits stiffen the heart muscle, reducing its ability to pump blood effectively and leading to heart failure	Severe — can be life-threatening if untreated
Kidneys	Swelling in legs and ankles, foamy urine, decreased urination	Protein buildup damages the kidney’s filtering units, causing protein to leak into urine and impairing waste removal	Moderate to Severe — may progress to kidney failure
Nervous System	Numbness, tingling, pain in hands and feet, dizziness upon standing	Nerve damage (peripheral neuropathy) and autonomic dysfunction affect sensation, balance, and blood pressure regulation	Moderate — significantly impacts daily function
Digestive System	Nausea, diarrhea, constipation, unintended weight loss, poor appetite	Amyloid deposits in the gastrointestinal tract disrupt normal digestion, nutrient absorption, and bowel motility	Mild to Moderate — varies widely among patients
Liver and Spleen	Abdominal swelling, feeling of fullness, elevated liver enzymes	Organ enlargement (hepatomegaly or splenomegaly) occurs as amyloid accumulates, reducing normal organ function	Mild to Moderate — often detected on imaging
General/Whole Body	Extreme fatigue, unintended weight loss, enlarged tongue (macroglossia)	Systemic amyloid deposition affects multiple organs simultaneously, causing widespread energy depletion and physical changes	Moderate to Severe — early medical evaluation essential

Normally, your body breaks down proteins at roughly the same rate it produces them. However, amyloid proteins are unusually stable. Your body cannot break them down fast enough, so they build up over time.

These deposits can be localized (found in one area) or systemic (spread throughout the body). Systemic amyloidosis is the more serious form. It can damage multiple organs at the same time and lead to organ failure if left untreated.

For more background on how proteins affect the body, visit Health Canada’s health information resources.

Types of Amyloidosis

Doctors classify amyloidosis based on the type of protein involved. Each type causes different symptoms and affects different organs. There are at least twenty known types of amyloid fibres linked to human disease.

AL Amyloidosis (Light Chain Amyloidosis)

AL amyloidosis is the most common type. It happens when abnormal antibody proteins, called light chains, build up in the body. This type is often linked to a blood cancer called multiple myeloma, though not always.

AL amyloidosis most commonly affects the kidneys, heart, intestinal tract, liver, and spleen. Damage to the kidneys can lead to kidney failure. Damage to the heart can cause congestive heart failure.

AA Amyloidosis

AA amyloidosis develops as a result of another long-term illness. It is most often linked to chronic inflammatory conditions such as rheumatoid arthritis, chronic infections, or a hereditary condition called familial Mediterranean fever.

This type also affects the kidneys, liver, and spleen. In addition, it can involve the adrenal glands, lymph nodes, and circulatory system. Kidney failure is the most common cause of death in AA amyloidosis. This type occurs in roughly one percent of people with inflammatory diseases.

ATTR Amyloidosis (Transthyretin Amyloidosis)

ATTR amyloidosis involves a protein called transthyretin, which normally carries thyroid hormone and vitamin A in the blood. When this protein misfolds, it forms amyloid deposits. This type is linked to hereditary nerve damage (familial amyloid polyneuropathy) and age-related cardiac amyloidosis.

AB2M Amyloidosis (Dialysis-Related Amyloidosis)

This type affects people who have been on kidney dialysis for a long time. Dialysis is a treatment that filters waste products from the blood when the kidneys can no longer do this on their own. Over time, a protein called beta2-microglobulin builds up and forms amyloid deposits.

Symptoms of Amyloidosis

The symptoms of amyloidosis vary widely. They depend entirely on which organs are affected. Unfortunately, the disease is often not diagnosed until serious organ damage has already occurred.

Common symptoms and signs include:

• Proteinuria — protein in the urine, often the first sign in AL and AA types
• Swelling in the legs, ankles, or around the eyes
• Fatigue and weakness
• Shortness of breath, especially with exertion
• Irregular heartbeat or feeling that the heart is racing
• Numbness or tingling in the hands or feet (peripheral neuropathy)
• Enlarged organs — the liver, spleen, kidneys, or heart may grow larger than normal
• Cognitive changes — memory problems or confusion, in cases where amyloid deposits form in the brain
• Unintended weight loss
• Digestive problems, including diarrhea or constipation

Because these symptoms overlap with many other conditions, amyloidosis can be difficult to spot. However, if you notice several of these signs together — especially swelling with fatigue and shortness of breath — it is important to speak with a healthcare provider.

How Is Amyloidosis Diagnosed?

Diagnosing amyloidosis requires a biopsy — a small sample of tissue taken from the body and examined under a microscope. Amyloid fibres show up clearly in these tissue samples when stained with a special dye called Congo red.

For systemic amyloidosis, doctors may take a biopsy from several sites, including:

• Abdominal fat (a fat pad aspirate, which is a simple and low-risk procedure)
• Rectal tissue
• The kidneys

Your doctor will also likely order blood tests, urine tests, and imaging studies such as an echocardiogram (heart ultrasound) or MRI. These help assess how much organ damage has occurred. The Mayo Clinic provides a detailed overview of amyloidosis diagnosis and testing.

Treatment Options for Amyloidosis

There is no single cure for amyloidosis, but treatment has improved significantly in recent years. The goal of treatment is to slow or stop the production of the abnormal proteins, prevent further deposits from forming, and — where possible — help the body reabsorb existing deposits.

Treating AL Amyloidosis

Treatment for AL amyloidosis often involves chemotherapy drugs that target the abnormal plasma cells producing the light chain proteins. In some cases, a stem cell transplant may be an option. Your specialist will tailor the treatment plan based on how far the disease has progressed and which organs are affected.

Treating AA Amyloidosis

For AA amyloidosis, the focus is on managing the underlying inflammatory disease. When the root cause — such as rheumatoid arthritis or a chronic infection — is brought under control, the production of amyloid proteins may slow down significantly. Anti-inflammatory medications play a key role in this approach.

Treating ATTR and Hereditary Amyloidosis

For hereditary forms of amyloidosis, genetic counselling is an important part of the care plan. In some cases, a liver transplant has proven effective. The liver produces the mutant transthyretin protein, so removing and replacing it can stop the disease from progressing. Some patients have even seen improvement in their autonomic nervous system function after transplant.

Newer targeted therapies are also available for ATTR amyloidosis, including drugs that stabilize the transthyretin protein or silence the gene responsible for its production. Your specialist can advise whether these are appropriate for your situation.

Supportive Care

Supportive care helps manage symptoms and protect organ function. This may include medications for heart failure, diuretics to reduce swelling, and dialysis for kidney failure. A team of specialists — including cardiologists, nephrologists, and neurologists — often works together to manage amyloidosis. Healthline offers a helpful patient-friendly guide to amyloidosis treatment.

When to See a Doctor

If you notice unexplained swelling, persistent fatigue, shortness of breath, or protein in your urine, do not wait. These symptoms can point to amyloidosis or other serious conditions that need prompt attention.

Start by making an appointment with your family doctor. If you do not have a family doctor, a walk-in clinic can assess your symptoms and refer you to a specialist if needed. Most provincial health plans in Canada cover specialist referrals when ordered by a primary care provider.

Early diagnosis gives you more treatment options and a better chance of preserving organ function. Please always consult a qualified healthcare professional before making any decisions about your health or treatment.

Frequently Asked Questions About Amyloidosis

Key Takeaways

• Amyloidosis is caused by the build-up of abnormal proteins (amyloid) in the body’s organs and tissues.
• The three main types are AL, AA, and ATTR — each linked to different underlying causes.
• The kidneys and heart are most commonly and most seriously affected.
• Early symptoms include protein in the urine, swelling, fatigue, and shortness of breath.
• Diagnosis requires a biopsy along with blood and urine tests.
• Treatment focuses on reducing amyloid production, managing symptoms, and protecting organ function.
• If you have concerns, speak with your family doctor or visit a walk-in clinic — early action leads to better outcomes.
• Always consult a healthcare professional for medical advice tailored to your personal situation.