The causes of tenosynovitis, simply put, the tendon sheath is a double-layered dense synovial tube that encases the tendons. It acts as a protective fluid sheath for the tendons, consisting of two layers enveloping the tendon. Between these two layers is a cavity filled with synovial fluid. The inner layer is closely attached to the tendon, while the outer layer lines the inside of the tendon fibrous sheath, jointly attaching to the bone. It primarily functions to stabilize, protect, and lubricate the tendons, preventing them from friction-induced damage and compression. Long periods of excessive friction can lead to damage in both the tendon and its sheath, leading to swelling and pain, which are the symptoms of tenosynovitis. For example, certain occupations such as bricklayers, carpenters, those who work extensively with computers, and chefs who frequently stir with spoons, as well as seamstresses in textile factories, are prone to developing tenosynovitis. There might be a link between this condition and occupational diseases. In such cases, applying heat can be helpful, and if the pain is particularly severe, enclosed treatments might be conducted. Additionally, taking drugs that promote blood circulation and relieve pain might be advisable. In severe cases, surgical treatment may be necessary. (The use of medications should be under the guidance of a doctor.)