Elbow muscle soreness may be caused by the following conditions: First, the elbow did heavy labor or long time strenuous exercise the day before, local lactic acid accumulation in the muscle, thus stimulating the muscle and appearing soreness, pain and weakness, through two to three days of lactic acid metabolism, no lactic acid accumulation will naturally ease the symptoms. Second, the elbow often does labor or physical exercise, causing local chronic sterile inflammation and resulting in soreness. Third, it may be caused by osteochondritis, the most common being humeral epicondylitis or humeral medial epicondylitis, which is often referred to as tennis elbow or golf elbow, which also stimulates the surrounding muscles and causes soreness.