Complex Regional Pain Syndrome (CRPS) is a chronic pain condition characterized by severe, continuous pain typically affecting an arm or leg.

Complex Regional Pain Syndrome (CRPS) is a chronic pain condition that typically affects an arm or leg, characterized by intense pain and changes in skin color and temperature.

Castleman disease is a rare disorder characterized by abnormal growth of lymph nodes and overactive immune response.

Sjögren's syndrome is a chronic autoimmune disorder that affects moisture-producing glands, causing dryness in the eyes and mouth.

Mixed connective tissue disease (MCTD) is an autoimmune disorder characterized by a combination of symptoms from various connective tissue diseases.