Lateral epicondylitis, as tennis elbow, has become a common injury for most people. This essay investigates the anatomy, susceptible groups, causes, diagnosis, treatment, and prevention of tennis elbow. At this time, the popularity of sports such as tennis has led to a significant increase in the percentage of cases reported, it affects about 1-3 percent of the population every year. Results show that tennis elbow occurs when tendons in the elbow are overloaded, leading to inflammation, degeneration, and potential tearing. The female group and smokers might increase the chances of having tennis elbow. The diagnosis consists of these two main methods. Microscopic testing is more accurate, while clinical testing is more suitable for testing at home. There are currently seven ways to treat tennis elbow. Sticking technology is a relatively conservative treatment method, but there are certain disadvantages, such as the relatively low effect, which may lead to muscle atrophy or joint contracture. Prevention mainly concerns stretching muscles and the correct way to play the ball.