15718 Amyloidosis Al Amyloid Light Chain

Overview

AL amyloidosis (also called light chain amyloidosis) is a rare condition in which abnormal proteins called amyloid build up in your organs and tissues. These proteins come from abnormal plasma cells in your bone marrow. Over time, the buildup can damage organs such as the heart, kidneys, liver, and nerves.

No. AL amyloidosis is rare. It affects around 5 to 10 people per million each year.

It most often affects adults over 50, and men slightly more often than women. It is very rare in children and teenagers.

Symptoms

Common symptoms

• Feeling very tired (fatigue)
• Unintentional weight loss
• Swelling in your legs, ankles, or abdomen
• Shortness of breath
• Numbness, tingling, or pain in your hands and feet
• Getting full quickly when eating, or feeling bloated
• An enlarged tongue, which can affect chewing or swallowing
• Skin changes, such as easy bruising or thickened areas
• Foamy or bloody urine, which can be a sign of kidney problems
• An irregular or rapid heartbeat

Symptoms in children

• AL amyloidosis is extremely rare in children. If it occurs, symptoms may be similar to adults and can include unusual tiredness, swelling, or poor weight gain. Children with these symptoms should see a pediatrician.

Symptoms in older adults

• Symptoms can be mistaken for normal aging, such as fatigue and breathlessness.
• Older adults may also experience heart-related symptoms like palpitations or fainting.
• Swelling in the legs and changes in memory or thinking can also be signs to discuss with a doctor.

Causes

Main causes

• Your bone marrow makes abnormal plasma cells that produce too many pieces of protein called light chains.
• These light chains misfold and stick together to form amyloid deposits.
• These deposits build up in organs and interfere with their normal function.

Risk factors

• Being over the age of 50
• Being male
• Having a blood condition called monoclonal gammopathy of undetermined significance (MGUS)
• Having a plasma cell disorder such as multiple myeloma

When to see a doctor

See a doctor urgently if:

• You have unexplained swelling in your legs or abdomen that is getting worse.
• You notice frothy or bloody urine.
• You have persistent numbness or weakness in your arms or legs.

Book a routine appointment if:

• If you have been feeling unusually tired or losing weight without trying, book a routine appointment with your GP.
• If you notice any symptoms that last for more than a few weeks, tell your doctor.

Diagnosis

To diagnose AL amyloidosis, your doctor will take a detailed history, examine you, and order blood and urine tests. The confirmation usually requires a tiny tissue sample called a biopsy. This is often taken from your belly fat, kidney, bone marrow, or another affected area, using a local anesthetic. The sample is looked at under a microscope to check for amyloid deposits. Special staining tests can show the type of amyloid protein.

Tests that may be done

• Blood tests to check for abnormal light chain proteins
• Urine tests to look for protein (especially a type called light chains in the urine)
• A biopsy (a small sample of tissue) from an affected organ, such as the kidney, heart, or abdominal fat
• An echocardiogram (ultrasound of the heart) or cardiac MRI to check heart function
• Bone marrow biopsy to look at plasma cells

What to expect at your appointment

Diagnosis can take time because symptoms are vague and tests need to be coordinated among specialists. You may be referred to a hematologist (doctor who treats blood disorders) and a cardiologist or kidney doctor. Try to bring a family member or friend to appointments to help you remember the information.

Treatment

Treatment for AL amyloidosis focuses on stopping the abnormal plasma cells from making the harmful light chain proteins. At the same time, you will receive supportive care to manage organ damage and symptoms. A team of doctors will tailor the treatment to your health and the organs affected.

Self-care at home

• Learn as much as you need to feel in control, but don't overwhelm yourself.
• Keep a list of your symptoms and questions for your doctor.
• Get regular rest and pace your activities.
• Ask for help from family, friends, or support services when you need it.
• Stay in contact with your healthcare team about any changes.

Medical treatments

Doctors use a combination of therapies to reduce abnormal plasma cells. This may include chemotherapy, corticosteroids, and newer targeted medicines that specifically regulate the plasma cell disorder. In some cases, high-dose chemotherapy followed by a stem cell transplant is recommended for people who are well enough. You may also need treatments to support your heart, kidneys, or nervous system, such as diuretics to reduce swelling or medicines to control blood pressure. The exact plan depends on your personal situation and should be discussed in detail with your hematologist.

When is surgery considered?

Surgery is not the main treatment for AL amyloidosis. Rarely, a person may need a procedure to support the heart, such as a pacemaker, or surgery to remove an amyloid deposit that is causing severe bleeding. These decisions are made by your care team.

Living with this condition

Living with AL amyloidosis means learning to manage fatigue and adjusting your daily routine. Many people find a steady balance between activity and rest. Keep a routine for meals, medications, and appointments. Tell your doctor about new symptoms early so support can be adjusted.

Lifestyle tips

• Get gentle exercise, such as walking, if you feel able and your doctor agrees.
• Talk to your healthcare team before starting any new activity.
• Reduce salt in your diet if you have swelling, as recommended.
• Limit alcohol, especially if your liver or heart is affected.
• Look after your mental and emotional health – it's part of treatment.

Diet and exercise

A balanced, varied diet can help keep your strength up. If your kidneys are affected, a kidney dietitian may advise specific changes, such as controlling protein, potassium, or salt. For exercise, focus on light activities that keep you mobile but don't exhaust you, like short walks or gentle stretching. Always check with your doctor or physical therapist first.

Mental health and emotional wellbeing

It is completely normal to feel anxious, low, or uncertain after a diagnosis. A serious long-term illness is a lot to adjust to. Talk to your doctor about counseling, mental health support, or joining a support group. You don't have to cope alone.

Prevention

AL amyloidosis cannot be prevented because the abnormal plasma cell change happens spontaneously and is not related to lifestyle. However, if you have MGUS or a related condition, your doctor will monitor you regularly with blood and urine tests so that any change can be caught early.

Vaccines

Staying up to date with recommended vaccinations, such as the flu shot, pneumonia vaccine, and COVID-19 vaccine, is especially important because your immune system may be affected by the disease or its treatment. Ask your doctor or pharmacist which vaccines are right for you.

Screening programmes

There is no routine screening for the general public. If you have MGUS, your doctor will arrange regular checks. If you have a family history of a related plasma cell disorder, discuss this with your doctor, but AL amyloidosis is not strongly linked to family inheritance.

Complications

If left untreated

• Progressive kidney damage, which can lead to kidney failure needing dialysis
• Heart problems, including heart failure and abnormal heart rhythms
• Nerve damage causing weakness, numbness, or pain in the hands and feet
• Enlarged tongue that makes eating and talking difficult
• Bleeding problems, such as easy bruising or bleeding under the skin
• Life-threatening organ failure

Long-term outlook

With earlier diagnosis and modern treatments, the outlook for AL amyloidosis is improving. Many people respond well to therapy, and some go into remission, meaning the abnormal protein levels drop and symptoms improve. The outcome depends on which organs are involved and how the disease reacts to treatment. Your care team will work with you to give you the best possible quality of life.

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