Lateral epicondylitis is a pathologic condition of the musculotendinous system, characterized by the presence of pain at the lateral epicondyle of the humerus; it is a tendinopathy of the extensor muscles of the forearm, often caused by overuse or repetitive use of the arm, forced extension of the elbow, or direct trauma to the humeral epicondyle. This study evaluated the efficacy of Extracorporeal ShockWave Treatment (ESWT) combined with a supplemental nutraceutical treatment of Hyaluronic Acid, Collagen, Vitamin C, and Manganese, compared with single treatment in patients with lateral epicondylitis in term of improvement in pain, functional capacity, muscle strength, and reduction of inflammation on ultrasound images. A clinical trial was conducted at the U.O.C. of Recovery and Functional Rehabilitation of A.O.U.P. P. Giaccone of Palermo from Marc 2024 to July 2024. Patients were randomized into 3 groups: in group A, n° 5 sessions of focal ESWT were given every six days; in group B, patients took daily for 30 days, supplemental nutraceutical treatment of Hyaluronic Acid, Collagen, Vitamin C, and Manganese; and group C, patients had combined treatment of ESWT (one session every six days for a total of five sessions) and nutraceutical supplementation (one administration per day for one month). All patients were evaluated at enrollment (T0), after one month, at the end of rehabilitation treatment (T1), and at a follow up 30 days after the end of treatment (T2). Researched will compare patients treated with ESWT or with nutraceutical treatment, and patients who had combined treatment to see if there are real differences in term of pain reduction and improved short- and long-term quality of life.