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Risk factors
By Mayo Clinic staffThe exact cause of thumb arthritis is unclear, but these factors increase your risk:
- Being female
- Being 40 years or older
- Having certain hereditary conditions, including joint ligament laxity and malformed joints
- Past injuries to your basal joint, such as fractures and sprains
- Having diseases that change the normal structure and function of cartilage, such as rheumatoid arthritis
- Certain activities and jobs that put high stress on this joint
