Nothing works without our fingers. We need them to cut, to type or to tie our shoes. We bend and stretch them. That's why the phenomenon of "fast fingers" or "snap fingers" is not so rare.
Can you only stretch your finger with difficulty or does it suddenly snap forward? Then you may be suffering from tendovaginitis stenosans.
A fast finger usually occurs when the tendon is thickened. However, a constriction of the tendon sheath caused by an inflammation can also cause a fast finger.
The triggers for this have not yet been conclusively clarified.
However, there is the approach that either a congenital predisposition for a snap finger or also overloading of the hands and fingers can play a role. Fast fingers can also occur in the context of a rheumatic disease.