Tingling in the pinky finger can be caused by a disorder of the neck spine, anatomical abnormality around the clavicle (cervical rib, anomalous muscles resulting in thoracic outlet syndrome), disorders of the elbow (cubital tunnel syndrome), wrist (Guyon's canal syndrome), hand (hammer hand syndrome) or the pinky finger itself (injury).
Guyon's Canal Syndrome
Tingling in the pinky finger resulting from the entrapment of the ulnar nerve on the pinky-palmar side of the wrist, in the canal called ulnar canal or Guyon's canal, is called Guyon's canal syndrome. Often there is no visible change in the wrist or hand.
Main causes include:
- Anatomical abnormality in the wrist (anomalous bones, accessory muscles...)
- Ganglion cyst, lipoma, neuroma or other benign tumor
- Rheumatoid arthritis
- Overuse of the wrist (assembly workers)
- Constant or repeating leaning on the wrist(s): (cyclists, crutches users, weight lifters...)
- Tenderness or stiffness in the wrist
- Tingling or, later in the course of a disorder, numbness in the pinky finger and the adjacent half of the ring finger
- Difficulty closing (adducting) the little finger after all fingers has been spread — this can result in hooking of the pinky finger at the pocket edge.
- Weaker grip, dropping objects
- Difficulty make a pinch with a thumb and index finger
- Rest (if the main cause is wrist overuse)
- Wearing a splint (at least at night)
- Nonsteroidal painkillers
- Steroid injection
- Decompression surgery at the wrist