De Quervain’s Tenosynovitis is a painful condition that affects the tendons at the base of the radial (thumb) side of the wrist. De Quervain’s Tenosynovitis occurs when the tendons at the base of the wrist become irritated or restricted. This condition is often linked to activities requiring repeated wrist movements or grasping including gardening, tennis, texting, golf, hammering, and rock climbing.