De Quervian’s (dih-kwer-vains) is when there is pain and inflammation at the tendons (tendonitis/tenosynovitis) at the base of your thumb. Repetitive movements that involve pinching with your thumb and twisting at your wrist can cause it. Properly stretching your thumb and forearm muscles, and strengthening them when you’re ready, will get you feeling better.
This condition sometimes end ups needing surgery but persistent exercises can get rid of it for good. Frequent but gentle stretching is the way to go, and as the pain subsides then you’ll need to start in with light strengthening exercises as well. It’s a nagging injury, but it can be fixed conservatively.