IgA nephropathy, sometimes known as Berger disease, is the most common form of nephropathy worldwide, and it happens when an abnormal IgA forms and deposits in the kidneys, causing kidney damage.

IgA肾病，有时也叫Berger病，是全球最常见的肾病；该病有异常IgA形成，沉积于肾，造成肾损伤。