Tendon sheath cysts are completely curable after scientific treatment, tendon sheath cysts are caused by repeated friction between tendons and tendon sheaths due to too much activity, just like a balloon wrapped in a packet of water, the more activity, the larger the amount of fluid formed, the larger the cyst will become, this is a benign lesion, no malignancy will occur. In the early stage when the cyst is relatively small, it basically does not affect the activity and does not cause pain, and this period can gradually recover itself by reducing the activity. However, with further increase in activity, the cyst will gradually become larger and compression of the surrounding blood vessels or nerves will lead to numbness, pain and inadequate distal blood supply. Or when it becomes significantly larger and severely affects the function of joint movement, further treatment is required. Tendon sheath cysts are not curable if treated with oral medication alone, and can only be completely cured by surgical removal. If the fluid is simply extracted, the cyst will become smaller and the symptoms will improve within a short period of time, but with the extension of time, the cyst will form again, so the fundamental treatment is surgical removal.