It can strike at any time and at any age. When someone develops a chronic disease, it can cause debilitating, life-altering changes that penetrate every aspect of daily life.
IN-DEPTH: Nearly Half of All Americans Now Have a Chronic Disease
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A 3-year-old who was born with a rare immune system disorder in Virginia, on Dec. 26, 2019. EVA HAMBACH/AFP via Getty Images

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