My doctor says my sister has finger stiffness, but I don't understand. What does it mean?

Sense of tightness o. Stiffness in the fingers can be due to many different problems as there are many structures in the fingers. It might be due to joint disease or arthritis, tendonitis, tightness in the skin or other problems. It is important to determine where the problem exists to begin to determine the cause of the sensation of stiffness.