The Chinese New Year has become an essential entertainment activity, whether it’s among relatives, friends or colleagues, a few cell phone red envelopes are always sent out to liven things up. However, while we are excitedly clicking on the red envelopes with our cell phones, a common disease is getting closer and closer to us. This is finger flexor tenosynovitis. As we click on the phone, we will repeatedly flex and extend the finger in a short period of time, resulting in mechanical friction of the tendon sheath tissue, causing aseptic inflammatory changes, eventually leading to thickening of the tendon sheath and narrowing of the sheath canal, resulting in the development of finger flexor tenosynovitis, which is often referred to as trigger finger. How can I tell if I have this disease? We have a few self-diagnostic points (take the thumb as an example): 1. see if you have limited pain with restricted finger movement when the metacarpophalangeal joint is near the palmar side; 2. the nodule can be palpated at the painful area and can slide when the finger is flexed and extended; 3. the palpated nodule is often hindered by the narrowing of the tendon sheath when the finger is flexed and extended, but can suddenly slide through when you continue to flex the finger with force. The nodule is often obstructed by the narrowing of the tendon sheath during flexion and extension, but can suddenly slide through when one continues to flex the finger with force, with a popping sound. If you are sure that you have the above symptoms, then you should be suffering from finger flexor tendinitis.