You have 20 muscles in your forearm, the part of your arm between your elbow and your hand. They help you move your arms, hands, and fingers and perform many of the tasks of daily life. You can strain ...

De Quervain tenosynovitis is pain and swelling in the tendons around your thumb. Specifically, it affects the tendons of two muscles called abductor pollicis longus and extensor pollicis brevis. De ...

De Quervain's disease, a form of stenosing tenosynovitis, predominantly affects the tendons within the first dorsal compartment of the wrist, namely the abductor pollicis longus and extensor pollicis ...

Rest, ice, compression, and elevation help treat tendonitis at home. Overuse, like typing or running, often causes extensor tendonitis. Pain from tendonitis gets worse if you use the affected muscles ...