Ulnar tunnel syndrome is a condition that occurs when the ulnar nerve becomes compressed or irritated as it passes through a narrow space in the wrist called the ulnar tunnel (or Guyon’s canal). This nerve is responsible for sensation in the ring and little fingers as well as controlling some of the small muscles in the hand. When it is compressed, it can disrupt normal nerve signaling, leading to symptoms such as tingling, numbness, or a “pins and needles” sensation in those fingers. It may also affect grip strength and fine motor control in the hand.
This condition often develops due to repetitive wrist movements, prolonged pressure on the palm, wrist injuries, or structural changes that reduce space within the tunnel. Over time, irritation of the nerve can worsen, causing symptoms to become more persistent or noticeable during activities that involve gripping, cycling, typing, or leaning on the wrist. In some cases, individuals may also experience hand weakness or difficulty with coordination, especially in tasks requiring precise finger movement.
