The most common type—osteoarthritis, or wear-and-tear arthritis—occurs commonly in the joint at the base of the thumb, where the thumb meets the wrist. This joint, called the carpometacarpal ...

A 2019 study in Arthritis & Rheumatology found that nearly 10 million Americans have gout. While gout can affect any joint, the thumb is an unusual place for urate crystals to develop. The big toe ...