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Basal joint arthritis is wear-and-tear or use-and-abuse arthritis that affects the base of the thumb. It's a very common condition that occurs more often in women than in men, and usually happens after age 40.
A person's risk of this condition depends largely on their genetics and how they use their hands throughout life. Because of this, it's difficult to prevent this type of arthritis. The main symptom is pain at or near the base of the thumb, where the thumb joins the wrist.
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