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Diseases
Amyloidosis
Cancer (lymphoma, leukemia, or various solid tumors)
Diabetes mellitus*
Obesity*
Preeclampsia (also called toxemia of pregnancy)
Protozoal infections (usually schistosomiasis or malaria)
Some glomerulonephritis (including rapidly progressive glomerulonephritis caused by streptococcal or staphylococcal infection)
Systemic lupus erythematosus (lupus)*
Vasculitic disorders (immunoglobulin A–associated vasculitis , granulomatosis with polyangiitis, or microscopic polyangiitis)
Viral infections (particularly hepatitis B,* hepatitis C,* or human immunodeficiency virus [HIV]*)
Drugs
Gold
Nonsteroidal anti-inflammatory drugs (NSAIDs)*
Penicillamine
Heroin taken intravenously
Allergies
Insect bites
Pollens
Poison ivy and poison oak
* Asterisks indicate the most common causes.
