Background: Carpal tunnel syndrome (CTS) is disorder that causes discomfort in the hand and arm, including numbness and tingling. Carpal tunnel syndrome manifests itself when there is an impingement on the median nerve as it passes through the wrist. Ultrasound is becoming more and more used as a diagnostic imaging technique in the medical field. The sonographic evaluation allows for the visualisation of various structures with a horizontal resolution of 0.1 mm and a vertical resolution of 0.2 mm. Objective: Review of literature about carpal tunnel syndrome ultrasound diagnosis. Methods: To learn more about ultrasound for diagnosing carpal tunnel syndrome, we searched scientific journals and resources including PubMed, Google Scholar, and Science Direct. However, only the most recent or thorough studies were taken into account between August 1984 and August 2020. The authors also evaluated the value of references obtained from other novels in the same genre. Due to a lack of resources, documents written in languages other than English have been ignored. Dissertations, oral presentations, and conference abstracts were all mostly agreed upon not to be scientifically valid. Conclusion: The examination of CTS using US has becoming increasingly common. Ultrasound (US) among cases patients who had electromyographic (EMG) results of CTS has the advantage of detecting alterations of structure as well as swelling of nerve, however it could also be utilized for visualization of other abnormalities that EMG couldn't detect.