Introduction: This study seeks to compare two treatment methods of lateral epicondylitis: corticosteroid injection and a local anesthetic injection. Patient and methods: In this single blinded randomized clinical trial, 15 patients were assigned into CSI group receiving methylprednisolone 1 ml, another 15 patients were assigned into LAI group receiving procaine 1 ml 2% in a single dose. Primary outcome was by Quick DASH score while secondary outcome was by VAS score. Follow-up was at 3-, 6- and 12-week post treatment visits. Results: The recovery rate was more effective and higher in CSI group especially at 3-week visit. Conclusion: CSI has the best short-term treatment results yet a high recurrence rate.