Prognosis varies with the type of amyloidosis. Prognosis for untreated AL amyloidosis is poor with median survival of one to two years. More specifically, AL amyloidosis can be classified as stage I, II or III based on cardiac biomarkers like troponin and BNP. Survival diminishes with increasing stage, with estimated survival of 26, 11 and 3.5 months at stages I, II and III, respectively.

Outcomes in a person with AA amyloidosis depend on the underlying disease and correlate with the concentration of serum amyloid A protein.

People with ATTR have better prognosis and may survive for over a decade.

Senile systemic amyloidosis was determined to be the primary cause of death for 70% of people over 110 who have been autopsied.

The three most common forms of amyloidosis are AL, AA, and ATTR amyloidoses. The median age at diagnosis is 64.

In the western hemisphere, AL is the most prevalent, comprising 90% of cases. In the United States it's estimated that there are 1,275 to 3,200 new cases of AL amyloidoses a year.

AA amyloidoses is the most common form in developing countries and can complicate longstanding infections with tuberculosis, osteomyleitis, and bronchiectesis. In the west, AA is more likely to occur from autoimmune inflammatory states. The most common causes of AA amyloidosis in the West are rheumatoid arthritis, inflammatory bowel disease, psoriasis, and familial Mediterranean fever.

People undergoing long term hemodialysis (14–15 years) can develop amyloidosis from accumulation of light chains of the HLA 1 complex which is normally filtered out by the kidneys.

Senile amyloidosis resulting from deposition of normal transthyretin, mainly in the heart, is found in 10–36% of people over 80.

AA amyloidosis is a complication of a number of inflammatory diseases and infections, although only a small portion of patients with these conditions will go on to develop AA amyloidosis. A natural history study of AA amyloidosis patients published in the New England Journal of Medicine reported a number of conditions associated with AA amyloidosis. The most common presentation of AA amyloidosis is renal in nature, including proteinuria, nephrotic syndrome and progressive development of renal insufficiency leading to End Stage Renal Disease (ESRD) and need for renal replacement therapy (e.g. dialysis or renal transplantation).

- Autoimmune diseases

- Rheumatoid arthritis

- Ankylosing spondylitis

- Crohn's disease and ulcerative colitis

- Chronic infections

- Tuberculosis

- Bronchiectasis

- Chronic osteomyelitis

- Autoinflammatory diseases

- Familial Mediterranean fever (FMF)

- Muckle–Wells syndrome (MWS)

- Cancer

- Hodgkin's lymphoma

- Renal cell carcinoma

- Chronic foreign body reaction

- HIV/AIDS

- Silicone-induced granulomatous reaction

There is evidence that eating amyloid fibers may lead to amyloidosis. This evidence is based on studies in cattle, chickens, mice, and cheetahs. Thus, in a sense, SAA amyloidosis may be considered a contagious disease, although whether this occurs or is important in the development of naturally occurring amyloidosis remains unknown. Nevertheless, because amyloid fibers can be detected in muscle in low amounts, it raises some concern about whether people could develop amyloidosis as a result of ingesting meat from an animal with the disease.

AL amyloidosis is a rare disease; only 1200 to 3200 new cases are reported each year in the United States. Two thirds of patients with AL amyloidosis are male and less than 5% of patients are under 40 years of age.

Median survival for patients diagnosed with AL amyloidosis was 13 months in the early 1990s, but had improved to c. 40 months a decade later.

Organ-limited amyloidosis is a category of amyloidosis where the distribution can be associated primarily with a single organ. It is contrasted to systemic amyloidosis, and it can be caused by several different types of amyloid.

In almost all of the organ-specific pathologies, there is significant debate as to whether the amyloid plaques are the causal agent of the disease or instead a downstream consequence of a common idiopathic agent. The associated proteins are indicated in parentheses.

The median time to progression to end stage renal disease is 2.7 years. After 5 years, about 37% of patients with LCDD are alive and do not have end stage renal disease.

Haemodialysis-associated amyloidosis is a form of systemic amyloidosis associated with chronic kidney failure.

Long-term haemodialysis results in a gradual accumulation of β microglobulin, a serum protein, in the blood. It accumulates because it is unable to cross the dialysis filter.

Affected individuals usually present after 5 years of dialysis rarely before that. The tendency of haemodialysis-associated amyloidosis is to be articular in general affecting the joints.

There is no clear obvious cause for scleroderma and systemic sclerosis. Genetic predisposition appears to be limited: genetic concordance is small; still, there is often a familial predisposition for autoimmune disease. Polymorphisms in "COL1A2" and "TGF-β1" may influence severity and development of the disease. There is limited evidence implicating cytomegalovirus (CMV) as the original epitope of the immune reaction, as well as parvovirus B19. Organic solvents and other chemical agents have been linked with scleroderma.

One of the suspected mechanisms behind the autoimmune phenomenon is the existence of microchimerism, i.e. fetal cells circulating in maternal blood, triggering an immune reaction to what is perceived as foreign material.

A distinct form of scleroderma and systemic sclerosis may develop in patients with chronic renal failure. This form, nephrogenic fibrosing dermopathy or nephrogenic systemic fibrosis, has been linked to exposure to gadolinium-containing radiocontrast.

Bleomycin (a chemotherapeutic agent) and possibly taxane chemotherapy may cause scleroderma, and occupational exposure to solvents has been linked with an increased risk of systemic sclerosis.

Most individuals diagnosed with LECT2 amyloidosis in the United States (88%) are of Mexican descent and reside in Southwest region of the United States (New Mexico, Arizona, far Western Texas). Other groups with higher incidence rates of the disorder include First Nation Peoples in Canada, Punjabis, South Asians, Sudanese, Native Americans, and Egyptians. In Egyptians, for example, LECT2 is second most common cause of renal amyloidosis, accounting for nearly 31% of all cases.

ALECT2 amyloidosis is generally diagnosed in individuals between the ages 40 and 90, with a mean age of 67 years old. The disorder commonly presents with renal disease that in general is advanced or at an end stage. Associated signs and symptoms of their renal disease may include fatigue, dehydration, blood in urine, and/or other evidence for the presence of the nephrotic syndrome or renal failure. Further studies may find that these individuals have histological or other evidence of LECT2 amyloid deposition in the liver, lung, spleen, kidney, and/or adrenal glands but nonetheless they rarely show any symptoms or signs attributable to dysfunction in these organs. Unlike many other forms of systemic amyloidosis, LECT2 deposition has not been reported to be deposited in the myocardium or brain of affected individuals. Thus, LECT2 amyloidosis, while classified as a form of systemic amyloidosis, almost exclusively manifests clinically as renal amyloidosis. No familial link has been found in the disorder although there have been several cases described among siblings.

Based on studies conducted in the United States, the prognosis for individuals with ALECT2 amyloidosis is guarded, particularly because they are elderly and their kidney disease is usually well-advanced at the time of presentation. End-stage renal disease develops in 1 out of 3 patients and has a median renal survival of 62 months. A suggested prognostic tool is to track creatinine levels in ALect2 patients. The attached Figure gives survival plotss for individuals with LECT2 renal amyloidosis and serum creatinine levels less than 2 mg/100 ml versus 2 mg/100 ml or greater than 2 mg/100 ml. The results show that afflicted individuals with lower creatinine levels have a ~four-fold higher survival rate.

Primary systemic amyloidosis (AL amyloidosis or just primary amyloidosis) is a disease that involves the mesenchymal tissue, the tongue, heart, gastrointestinal tract, and skin.

Secondary systemic amyloidosis is a condition that involves the adrenal gland, liver, spleen, and kidney as a result of amyloid deposition due to a chronic disease such as Behçet's disease, ulcerative colitis, etc.

Systemic scleroderma is a rare disease with an annual incidence of 1 to 2 per 100,000 individuals in the United States. The interval of peak onset starts at age 30 to 35 and ends at age 50 to 55.

In the United States, the prevalence of systemic scleroderma is about 50,000, with different studies giving different estimates, usually ranging between 40,000 and 165,000.

Annual incidence of systemic sclerosis is 19 per million, and prevalence is 19–75 per 100,000, with a female:male ratio of 3:1 (8:1 in mid- to late childbearing years). Incidence is twice as high among African Americans. The Choctaw Native Americans in Oklahoma have the highest prevalence in the world (469 per 100,000).

The disease has some hereditary association. It may also be caused by an immune reaction to a virus (molecular mimicry) or by toxins.

As recognition of IgG4-RD is relatively recent, there are limited studies on its epidemiology. It is therefore difficult to make an accurate estimation of prevalence. Furthermore, age of onset is almost impossible to estimate; age at diagnosis is frequently misused as the age of onset.

A 2011 study estimated the incidence of IgG4-RD in Japan at 2.8–10.8/million population, with a median age of onset of 58 years.

The disorder typically affects the heart and its prevalence increases in older age groups. Men are affected much more frequently than women. In fact, up to 25% of men over the age of 80 may have evidence of WTTA.

Patients often present with increased thickness of the wall of the main heart chamber, the left ventricle. People affected by WTT amyloidosis are likely to have required a pacemaker before diagnosis and have a high incidence of a partial electrical blockage of the heart, known as left bundle branch block. Low ECG signals such as QRS complexes are widely considered a marker of cardiac amyloidosis.

A much better survival has been reported for patients with WTTA as opposed to cardiac AL amyloidosis .

Primary cutaneous amyloidosis is a form of amyloidosis associated with oncostatin M receptor. This type of amyloidosis has been divided into the following types:

- Macular amyloidosis is a cutaneous condition characterized by itchy, brown, rippled macules usually located on the interscapular region of the back. Combined cases of lichen and macular amyloidosis are termed biphasic amyloidosis, and provide support to the theory that these two variants of amyloidosis exist on the same disease spectrum.

- Lichen amyloidosis is a cutaneous condition characterized by the appearance of occasionally itchy lichenoid papules, typically appearing bilaterally on the shins.

- Nodular amyloidosis is a rare cutaneous condition characterized by nodules that involve the acral areas.

Familial renal amyloidosis (or familial visceral amyloidosis, or hereditary amyloid nephropathy) is a form of amyloidosis primarily presenting in the kidney.

It is associated most commonly with congenital mutations in the fibrinogen alpha chain and classified as a dysfibrinogenemia (see Hereditary Fibrinogen Aα-Chain Amyloidosis). and, less commonly, with congenital mutations in apolipoprotein A1 and lysozyme.

It is also known as "Ostertag" type, after B. Ostertag, who characterized it in 1932 and 1950.

Wild-type transthyretin amyloid accumulates mainly in the heart, where it causes stiffness and often thickening of its walls, leading consequently to shortness of breath and intolerance to exercise, called diastolic dysfunction. Excessively slow heart rate can also occur, such as in sick sinus syndrome, with ensuing fatigue and dizziness. Wild-type transthyretin deposition is also a common cause of carpal tunnel syndrome in elderly men, which may cause pain, tingling and loss of sensation in the hands. Some patients may develop carpal tunnel syndrome as an initial symptom of wild-type transthyretin amyloid.

There appears to be an increase in the risk for developing hematuria or blood in the urine due to urological lesions.

There is no standard treatment for LCDD. High-dose melphalan in conjunction with autologous stem cell transplantation has been used in some patients. A regimen of bortezomib and dexamethasone has also been examined.

Liver transplantation has proven to be effective for ATTR familial amyloidosis due to Val30Met mutation.

Alternatively, a European Medicines Agency approved drug Tafamidis or Vyndaqel now exists which stabilizes transthyretin tetramers comprising wild type and different mutant subunits against amyloidogenesis halting the progression of peripheral neuropathy and autonomic nervous system dysfunction.

Currently there are two ongoing clinical trials undergoing recruitment in the United States and worldwide to evaluate investigational medicines that could possibly treat TTR.

The familial amyloid neuropathies (or familial amyloidotic neuropathies, neuropathic heredofamilial amyloidosis, familial amyloid polyneuropathy) are a rare group of autosomal dominant diseases wherein the autonomic nervous system and/or other nerves are compromised by protein aggregation and/or amyloid fibril formation.

Heredofamilial amyloidosis is an inherited condition that may be characterized by systemic or localized deposition of amyloid in body tissues.