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Anyone at any age can get IgA nephropathy although it’s more common in men. Caucasians and Asians also have a higher incidence of IgA nephropathy than other ethnic groups.
It’s still unknown how people develop IgA nephropathy and why IgA traps itself in the kidneys. In some cases, it can develop after a child or young adult has a viral infection of the upper respiratory or gastrointestinal tracts. For some people, a genetic defect may be linked to the development of IgA nephropathy.