Tenosynovitis is mainly caused by prolonged engagement in certain activities, leading to frequent tendon movements within the tendon sheath, which in turn causes inflammatory damage, resulting in swelling, pain, and restricted movement of the tendon and sheath. For the treatment of tenosynovitis, it is important to first rest and stop engaging in the frequent activity. When symptoms occur, anti-inflammatory and analgesic medications, heat applications, physiotherapy, and local injections can be used for treatment. These methods can play an active role in improving symptoms and reducing inflammatory responses. If conservative treatment is ineffective, or if there is a functional impairment, surgical methods can also be considered for treatment.