Assertion: rheumatoid arthritis's pain | /r/CapableOf | affect knee
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text: Characteristic Rheumatoid Arthritis Osteoarthritis Type of disease Autoimmune disease Degenerative disease Onset of disease 20 to 40 years old, but can occur any time in life Usually begins after 50 Speed of onset Rapid, within a year Slow, over several years Time of outbreak Worse in the morning or after lack of activity or rest Worsens with activity throughout the day Symptoms Joint pain, stiffness, swelling, reduced range of motion, fatigue Joint pain, stiffness, and decreased range of motion Location of symptoms Causes swelling in pairs of joints such hands, ankles, and wrists Affects weight-bearing joints such as hips, knees, and spine; but also hands Prevalence of disease About 1.5 million people in the U.S.