What causes De Quervain's tenosynovitis?

Repeated gripping, lifting, pinching, wringing, or movements that angle the wrist toward the little finger can increase friction in this confined tendon tunnel. A sudden change in hand use may contribute, although some people cannot identify one specific trigger.

Two tendons that help move the thumb pass through a narrow sheath near the wrist. Swelling or thickening within that sheath reduces the room available for smooth gliding. De Quervain's tenosynovitis commonly presents with pain and tenderness near the base of the thumb, especially during grasping or thumb movement.

Symptoms may extend into the forearm, and the area can feel swollen or catch during movement. The condition is related to tendon irritation rather than a problem inside the thumb joint itself.

Temporarily reduce forceful gripping, repetitive thumb scrolling, and lifting with the thumb spread away from the hand. Keep the wrist in a neutral position where practical, use both hands for heavier objects, and avoid repeatedly testing a movement that reproduces sharp pain.

A clinician may examine thumb and wrist movement and discuss activity modification, splinting, hand therapy, or an injection. Persistent symptoms can require specialist assessment; surgery is generally considered only when appropriate non-surgical care has not provided enough relief.

Arrange an appointment if pain keeps returning, limits grip, interferes with caring tasks, or does not settle after reducing the provoking activity. Seek urgent care after a significant injury, or if the hand becomes cold, pale, blue, markedly swollen, numb, weak, or difficult to move. Redness spreading from the wrist, fever, or a hot swollen area also warrants prompt evaluation.

Ask which movements are likely maintaining the irritation, whether a thumb-supporting splint suits your activities, and how to adjust work, exercise, or lifting technique. You can also ask what findings would suggest another cause of thumb-side wrist pain and what improvement should look like before normal loading resumes.