# Systemic Amyloidosis
What is it
Systemic amyloidosis is a rare disease in which abnormal proteins deposit in the form of amyloid in various organs of the body. These protein accumulations gradually damage the organs and disrupt their normal functioning.
There are different types of systemic amyloidosis. The most common form is AL amyloidosis (light-chain amyloidosis), in which the body produces incorrectly formed proteins. Another important type is ATTRm amyloidosis, in which a hereditary gene causes malformed transthyretin proteins. There is also ATTRwt amyloidosis, in which healthy people unexpectedly begin to produce abnormal proteins later in life.
The distinction between these types is important, because they are treated differently and progress differently. What all forms have in common: the harmful proteins accumulate where they do not belong, and this process is slow but progressive. The kidneys, heart, nerves and digestive system are often involved.
Causes
In AL amyloidosis, something goes wrong with the cells in the bone marrow that normally make antibodies. These cells suddenly begin to produce large quantities of malformed light-chain proteins. Why this happens is not yet fully clear. It is not a hereditary condition, but occurs spontaneously.
In ATTRm amyloidosis, there is a hereditary cause: a mutation in the TTR gene causes the transthyretin protein to form incorrectly. This protein is made mainly in the liver and plays a role in the transport of certain substances through the body. The malformed version accumulates as amyloid. If a parent has this gene, there is a 50% chance that children will inherit it as well.
In ATTRwt amyloidosis, there is no hereditary mutation; the body begins to produce abnormal transthyretin proteins for no clear reason. This usually happens in older men.
How the disease progresses
Systemic amyloidosis usually progresses gradually. The protein deposition process begins before people notice symptoms. Many patients feel "normal" for months or years before the disease becomes apparent.
The speed of progression depends on the type of amyloidosis, which organs are involved, and how quickly the abnormal proteins accumulate. Some people have a slowly progressing disease, others a more aggressive form.
**Phase 1: Before diagnosis (subclinical)**
In this phase, the abnormal proteins silently deposit in organs, usually without noticeable symptoms. Blood tests can sometimes already show elevations, but many people feel fine.
**Phase 2: First symptoms**
Symptoms appear when enough protein has accumulated. This can take years. The first complaints depend on which organ is most affected.
**Phase 3: Progressive damage**
The amyloid accumulation grows further. Organs function increasingly poorly. Symptoms worsen and possibly more organs become involved.
**Phase 4: Advanced stage**
In case of severe involvement of vital organs (especially heart or kidneys), life-threatening complications can occur.
Symptoms by phase
**Early stage:**
- Often no symptoms, but sometimes discovered incidentally by abnormal blood values
- Slight weight loss
- Unexplained fatigue
- Feeling of irregular heartbeat (palpitations)
**In case of heart involvement (very frequent):**
- Shortness of breath, especially with exertion and when lying down
- Tiredness and fatigue
- Swelling of legs and feet
- Heart rhythm disorders
**In case of kidney involvement:**
- Foamy urine
- Fluid accumulation (swollen legs, weight gain)
- Fatigue due to anemia
- Elevated blood pressure
**In case of nerve involvement (peripheral neuropathy):**
- Tingling or numbness in feet and hands, starting in the feet
- Muscle weakness, first in the legs
- Balance problems
- Pain in hands or feet
**In case of digestive involvement:**
- Difficulty swallowing
- Feeling full quickly when eating
- Diarrhea or constipation
- Weight loss
**In case of eye involvement (rare):**
- Vision problems
- Bleeding in the eye
What it means for daily life
The impact of systemic amyloidosis on daily life is significant and varies from person to person, depending on which organs are affected and how far the disease has progressed.
**Exertion and activity:**
Many patients experience reduced exercise tolerance. Tasks that were once easy — walking, climbing stairs, heavy housework — become more difficult. This worsens over time. It is therefore important to adapt activities to what is feasible.
**Nutrition:**
With digestive involvement, meals can become challenging. Smaller, more frequently distributed meals sometimes help. Some people must avoid certain foods due to swallowing difficulties or stomach problems.
**Work and career:**
Depending on severity, many patients can continue working, but sometimes with adjustments (more rest, flexible schedule). At advanced stages, work can become impossible.
**Social life and mental health:**
Chronic illness can be emotionally heavy. Unpredictability of symptoms, concerns about progression, and dependence on others can lead to anxiety and depression. Support from loved ones and sometimes professional psychological help are valuable.
**Medical care:**
Regular check-ups, many appointments, and possible hospitalizations are part of life with amyloidosis. This requires organization and patience.
**Fluid restriction:**
With heart involvement, fluid intake sometimes needs to be limited, requiring daily attention.
Outlook
The outlook for systemic amyloidosis is highly individual and depends on several factors: the type of amyloidosis, which organs are affected, how far the disease has progressed at diagnosis, and how well the disease responds to treatment.
**About survival:**
Data from a few years ago showed that patients with AL amyloidosis and heart involvement had an average survival of 6-12 months without treatment. With modern treatment, many patients are seen to live considerably longer, and some achieve remission (stop of protein production). However: such population figures say nothing about one individual. One person does well for years, another for much shorter.
ATTRm amyloidosis generally progresses more slowly than AL amyloidosis, and ATTRwt amyloidosis generally progresses even more slowly, especially if only the heart is affected.
**Impact of treatment:**
Good treatment response can slow progression or sometimes even stabilize it. Some patients reach a state where the disease no longer worsens rapidly.
**Quality of life:**
Even without a cure, many patients can continue their lives for years or decades with good symptom control. The goal of treatment is not always cure, but often to slow the process and relieve symptoms.
**What determines the course:**
- How quickly the abnormal proteins accumulate (biomarkers in the blood help measure this)
- Heart involvement, especially heart muscle stiffening
- Kidney function
- General health and age
- Response to treatment
Frequently asked questions
**Is systemic amyloidosis hereditary?**
That depends on the type. AL amyloidosis is not hereditary; it develops spontaneously in one person. ATTRm amyloidosis is hereditary and runs in families. If you have a parent with ATTRm, genetic testing can determine whether you have inherited the gene. ATTRwt amyloidosis is not hereditary. Your doctor will determine your type through testing.
**Can amyloidosis be cured?**
Not completely so far. The goal of treatment is mainly to prevent the production of abnormal proteins, slow progression, and relieve symptoms. Some patients achieve remission, which means the disease no longer actively progresses. Research into better treatments continues.
**Will my partner or child get it too?**
With AL amyloidosis and ATTRwt amyloidosis: no, your partner won't get it. Neither will your children, unless they happen to develop the same spontaneous mutation themselves (extremely rare). With ATTRm amyloidosis: children of a carrier have a 50% chance of inheriting the gene. Your partner won't get it from you. Genetic counseling can help explain what this means.
**Which doctors treat this?**
Cardiologists, nephrologists (kidney specialists), neurologists, and hematologists are all involved, depending on which organs are affected. Many large hospitals have amyloidosis experts. Your GP can help refer you to specialists.
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_This information never replaces a doctor's judgment. Always discuss your situation with your own healthcare provider._