Symptoms of arthritis in the thumb include swelling, pain, and stiffness at the basal (lower) thumb joint. It can also be caused by reactive arthritis, which is triggered by an infection in the body. ![]() In most cases, it’s osteoarthritis - the age-related breakdown of joint tissue - that causes a swollen thumb joint, especially at the lowest joint (called the basal joint). There are different reasons why one or more of your thumb joints might be swollen. One joint is located just above your wrist bone, and the other two are located about halfway up your thumb and near the tip of your thumb. ![]() The thumb is made up of three short bones connected by three joints.
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