Inability to extend the thumb is one of the symptoms of flexor tendon tenosynovitis, which mostly occurs in the thumb and middle finger. The dysfunction of the flexion and extension of the affected finger is particularly pronounced in the early morning and is relieved or disappears after activity. The pain sometimes radiates to the wrist. There may be pressure pain in the metacarpophalangeal joint flexion, and sometimes thickened tendon sheaths and pea-sized nodules may be palpable. When the affected finger is bent, it suddenly stays in the semi-bending position, the finger can neither be straightened nor flexed, as if it is suddenly stuck, and the pain is unbearable, after using the other hand to assist in triggering, the finger can move again, producing a trigger-like action and popping sound, so it is also called trigger finger or popping finger. Dietary considerations for patients who cannot stretch their thumbs: The diet of patients who cannot stretch their thumbs requires more vegetables, such as greens, bok choy, oranges, apples, pears, hawthorn, celery, etc. Eat more protein and calcium-rich foods and lean meat, chicken, eggs, soy milk, etc. Eat more fresh fruits and vegetables. You should pay attention to the intake of vegetables in your diet and nutrition, such as greens, bok choy, celery, etc. to supplement vegetable protein; eat more protein and calcium-rich foods, as well as animal protein through the intake of lean meat, chicken, eggs, etc. Since the inability to extend the thumb is most obvious when waking up in the early morning, care should be taken to keep the arm close to the body and the wrist unbent when going to sleep at night. Allowing the hands to hang over the side of the bed will increase the pressure on the hands. Elevate your hands: When you are resting, avoid bringing your hands below your shoulders. Support your elbows with the tabletop or lean them on the handle of the chair. Keep your hands facing upward. This is a beneficial resting position. When you sleep, keep your arms close to your body and your wrists unbent. If you let your hands hang over the side of the bed, it will increase the pressure on your hands.