What diseases are associated with the immune system?

Immune system diseases are a broad category of disorders involving abnormalities in the body's defense system, mainly including the following types: 1. Immunodeficiency diseases: These diseases are caused by reduced or impaired immune system function, such as HIV infection and hereditary angioedema. They may lead to increased susceptibility to various pathogens. 2. Autoimmune diseases: These occur when the immune system mistakenly attacks the body's own normal cells and tissues, such as rheumatoid arthritis, systemic lupus erythematosus, and Sjögren's syndrome. These diseases often result in inflammation and damage to specific organs or systems. 3. Immune proliferative diseases: These involve abnormal proliferation of components of the immune system, such as multiple myeloma and cytomegalovirus infection. Immune system diseases are diverse and complex in cause, posing significant threats to patients' health. Therefore, early detection and treatment are crucial.