Most of the time, it arises from a recurring motion or forceful use of your respective finger or thumb. Tendons are fibrous cords that connect muscle to bone. Every single tendon is surrounded by a protecting sheath.  The doctor will want to look at the patient's hand, such as screening https://www.theorthopaedicandpainpractice.com/why-cant-i-straighten-the-tip-of-my-finger/