De Quervain syndrome
Typically, this condition occurs from overuse of your thumb or wrist. This can cause thumb tendons to become irritated and swollen. When tendons swell, their movement becomes restricted in the narrow area they pass through near the wrist. Symptoms for De Quervain’s tendinitis include pain and swelling on the thumb side of the wrist, and numbness on the back of the thumb and index finger. Treatment for milder cases can include icing, medication, injections and rehabilitation. Advanced cases may require surgery. In these circumstances, surgeons will expand the constricted space around the tendons.