A member asked:

Last thumb joint by nail hyperextends on its own. no known injury. pain up arm toward elbow and under forearm after it happens. no arthritis. ?

A doctor has provided 1 answer

Tendinitis : You have hypermobility and that is why the thumb hyperextended this runs in families and is genetic . The pain may be tendinitis

Answered 8/3/2015

2.4k views

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