IgG4-related sclerosing disease (IgG4-related disease, IgG4-RD)

IgG4-related disease is an immune-driven, fibroinflammatory condition that can affect many organs, and in the digestive system it commonly involves the pancreas, where it is known as autoimmune pancreatitis, and the bile ducts, where it can closely resemble other liver and pancreas diseases. Research describes the process as involving a skewed immune response that drives infiltration of affected tissue by IgG4-producing plasma cells, leading to swelling and fibrosis in the organs involved.

Because it was only recognized as a distinct entity in the past two decades, researchers describe its prevalence as still quite limited, though reviews note it appears more often in men in mid-to-later adulthood. In the digestive system, symptoms can include yellowing of the skin or eyes from blocked bile flow and an enlarged organ that can be mistaken for cancer on imaging.

Common signs

Because it can settle in different organs, symptoms vary widely. Painless swelling of the salivary or tear glands, swollen lymph nodes, kidney changes found on blood or urine tests, and swelling around the eyes and eyelids are all recognized patterns, along with abdominal or back pain and weight loss. Some people have few symptoms since the disease tends to progress slowly.

This is a plain-language summary for orientation, not a diagnosis. Mechanisms are described as current understanding, not settled fact. Work with your own clinician for your care.