Why Can't I Bend My Thumb?
Inability to bend your thumb can stem from several conditions, most commonly trigger thumb, a painful condition affecting the tendons controlling thumb movement.
Trigger thumb, also known as stenosing tenosynovitis, occurs when a tendon or tendon sheath in your thumb becomes inflamed and swollen. This inflammation prevents the tendon from gliding smoothly through its sheath. As a result, the tendon can bunch up, forming a nodule, making it difficult or impossible to bend your thumb. The thumb might catch or lock in a bent or straight position. Trigger finger occurs if there's a problem with the tendon or sheath, such as inflammation and swelling. If the tendon can no longer slide easily through the sheath it can bunch up to form a small lump (nodule). This makes bending the affected finger or thumb difficult.
Symptoms of Trigger Thumb:
- A popping or snapping sensation when bending or straightening your thumb.
- A catching or locking sensation in your thumb joint.
- Pain and stiffness in the thumb.
- A lump or nodule in the palm near the thumb base.
Other Potential Causes
While trigger thumb is a frequent culprit, other factors can hinder thumb bending:
- Congenital anomalies: In rare instances, a thumb joint might not develop correctly, leading to limited or no bending ability. The right joint of my thumb never developed. I can't bend it... Flexor pollicis longus tendon anomalies are rare; several types of this congenital anomaly have been reported in the literature.
- Soft tissue injuries: Ligament tears or other soft tissue damage in the thumb can severely restrict movement. The ulnar collateral ligament (UCL) of the thumb is vulnerable to tearing as the thumb is bent backwards and away from the hand.
Seeking Medical Attention
If you experience difficulty bending your thumb, it's crucial to consult a healthcare professional. They can accurately diagnose the underlying cause and recommend appropriate treatment options.
