Epicondylitis is a condition that causes pain at the lateral epicondyle of the humerus and affects forearm function. In the past, this condition was mostly seen in tennis players, hence the name tennis elbow. Clinically, it is mostly seen in women. Etiology The common tendon of the forearm extensor muscle is attached to the lateral epicondyle of the humerus. If the muscle fibers tear and bleed due to strain, local aseptic inflammation and secondary adhesions occur, and when the forearm moves, the adhesions are pulled and local pain is induced, which can radiate downward along the radial carpal tunnel. It is thought that this disease also belongs to one of the vascular nerve bundle entrapment syndromes. Symptoms Pain at the lateral epicondyle of the humerus, radiating to the radial side of the forearm, inability to lift and carry heavy objects when flexing the elbow, therefore, inability to pour water from a hot water bottle, inability to mop the floor, inability to wring out towels. Signs Localized pressure pain, pressure pain over the lateral epicondyle of the humerus is a sprain of the starting point of the radial long wrist extensor; pressure pain over the lateral epicondyle of the humerus is a sprain of the starting point of the radial short wrist extensor; pressure pain near the radial tuberosity may be a radial circumflex ligament injury; extensive and obvious pressure pain over the radial wrist extensor muscle is a possible compression of the vascular nerve bundle. Note the differentiation from internal epicondylitis of the humerus and ulnar bursitis. Treatment Early massage treatment is more effective. If the pain is severe, local seal treatment is feasible. Small acupuncture has been adopted by many physicians.