Most of the joint pain of the thumb occurs due to chronic aseptic inflammation of the tendon of the thumb caused by playing with the phone for a long time, resulting in tenosynovitis, which should be treated as follows: First, try to reduce the time of playing with the phone and avoid doing flexion and extension of the finger repeatedly for a long time, which can remove the inflammation of the thumb and thus make the pain relieve or disappear. Secondly, oral medication can be used to treat the pain, such as meloxicam and celecoxib. Third, physical therapy, you can use hot compresses or microwave physiotherapy, far-infrared physiotherapy, which can relieve the local inflammation and pain of tenosynovitis. Fourth, can be closed treatment, can be used to close the drug to the tendon sheath for local injection, which can make the inflammation reduce or disappear, so as to relieve the pain. Fifth, surgery, if severe tendonitis after the above treatment effect is not obvious, to consider surgery, for the narrow tendon sheath to release.