What are the symptoms of thumb tendon sheath inflammation?

The main symptoms of de Quervain's tenosynovitis include the following: 1. Pain: Pain occurs at the base of the thumb joint during flexion and extension movements. This is caused by inflammatory changes in the tendon sheath, which leads to traction on the joint during movement and friction of surrounding tissues. 2. Limited mobility: Movement of the thumb joint becomes restricted, particularly noticeable upon waking in the morning. Symptoms may improve with activity. In severe cases, active movement of the joint may be completely limited. 3. Swelling: As inflammation worsens, edema may develop, causing swelling and discomfort in the thumb joint. 4. Nodules and "trigger finger" phenomenon: In moderate to advanced stages of the condition, nodules the size of peas may appear at the affected area. When bending the affected finger, it may suddenly get stuck in a partially bent position, as if "locked." The finger may require assistance from the other hand to extend or flex fully, and snapping or popping may occur, hence the term "trigger finger." If these symptoms occur, prompt medical attention is recommended.