Very similar story, earlier elbow/arm,shoulder pain that disappeared, but no known injury and 62 year old female, use computer mouse, keyboard a lot. No pain in thumb, just doesn't work to bend last distal joint.in right thumb. Same story, first noticed with trying to use a lighter. First joint seems to work fine. Just thought it was a curious mystery "fluke" associated with age, and not a big deal. But I guess it's been about 5 weeks so wondering how others have fared.