Overview of the Immune System

Function The overall function of the immune system is to prevent or limit infection. An example of this principle is found in immune-compromised people, including those with genetic immune disorders, immune-debilitating infections like HIV, and even pregnant women,...

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How the Aging Brain Affects Thinking

The brain controls many aspects of thinking — remembering, planning and organizing, making decisions, and much more. These cognitive abilities affect how well we do everyday tasks and whether we can live independently. Some changes in thinking are common as people get...

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Rheumatoid Arthritis

Diagnosis Rheumatoid arthritis can be difficult to diagnose in its early stages because the early signs and symptoms mimic those of many other diseases. There is no one blood test or physical finding to confirm the diagnosis. During the physical exam, your doctor will...

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Diseases and Conditions Rheumatoid Arthritis

Fast Facts Rheumatoid arthritis (RA) is the most common type of autoimmune arthritis. It is caused when the immune system (the body’s defense system) is not working properly. RA causes pain and swelling in the wrist and small joints of the hand and feet. Treatments...

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