DeQuervain’s tendonitis or “tenosynovitis,” is a common condition involving the tendons on the thumb-side of the wrist. The syndrome is named after Dr. Fritz de Quervain, a Swiss physician who described the condition in the late 1800s. Symptoms arise when there is entrapment of the tendons of the thumb by their surrounding sheath at the wrist. Instead of gliding smoothly through the sheath, the abductor pollicis longus (APL) and extensor pollicis brevis (EPB) tendons can meet resistance. Over time, these tendons may become irritated and painful. Certain movements of the thumb and wrist can be excruciating. Patients may feel a tender bump or notice swelling in the wrist where the tendons and/or sheath are thickened. Lifting objects, gripping, or pinching with the thumb often exacerbates symptoms. This condition is commonly seen in young females, especially young mothers. Click here for more information on our website.