Gamer’s Thumb. Mommy Thumb. Texting Thumb. They’re all different names for the same painful problem, in which the tendons that attach to the thumb rub against the “tunnel” that surrounds them and become inflamed. The medical term is De Quervain’s tendinosis (aka De Quervain’s tenosynovitis) and it can cause anything from mild discomfort to debilitating […]