More often than not, it arises from a repeated motion or forceful use of your finger or thumb. Tendons are fibrous cords that connect muscle mass to bone. Every tendon is surrounded by a protecting sheath.  Ache and Soreness: A typical symptom in several conditions, ranging from a dull ache https://www.theorthopaedicandpainpractice.com/why-cant-i-straighten-the-tip-of-my-finger/