Variable.: Pain in thumb that radiates up your forearm and maybe into arm can be tenosynovitis...Swelling and inflamation of the tendons that move the thumb as they travel through a compartment. Thumb base arthritis as well can cause pain. Fracture if there were trauma. Get evaluated but usually the tenosynovites (dequervain's tenosynovitis) and basal joint DJD are the most common.
Answered 12/17/2019
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Basal joint arthriti: Arthritis in the thumb joints are quite common and increasing due to the thumb texting phenomenon. See an orthopedic hand surgeon for an evaluation.
Answered 1/31/2018
5.6k views
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