There are many causes of elbow pain, and the common ones are lateral epicondylitis of the humerus, medial epicondylitis of the humerus, elbow arthritis, bursitis, and osteoporosis. Epicondylitis of the humerus is caused by chronic injury to the epicondyle of the humerus due to prolonged and repetitive forceful movements of the wrist, also known as tennis elbow. Common symptoms include pain and burning on the outside of the elbow, and reduced grip strength. Medial epicondylitis of the humerus is a chronic tendonitis of the forearm muscles at the attachment point of the medial epicondyle of the humerus. The main manifestation is pain in the medial aspect of the elbow joint. Medial epicondylitis of the humerus is actually a strain, aseptic inflammation of the muscle caused by overstretching of the muscle. Elbow arthritis is caused by the cartilage of the elbow joint wearing down and degenerating over the years, which is mainly manifested by the soreness of the joint, inability to flex the elbow joint or limited movement. Bursitis is an acute and chronic inflammation of the bursa, which can be caused by chronic wear and tear and acute injury. Bursitis is characterized by pain and swelling at the site of the lesion, which can lead to muscle atrophy and limited movement. Osteoporosis causes a reduction in the weight-bearing capacity of the bones, and insufficient weight-bearing capacity of the bones can cause tension and inflammatory exudation in the surrounding muscles and ligaments, resulting in pain. Osteoporosis can be caused by a lack of calcium and mainly affects middle-aged and elderly people. Patients with related diseases are advised to seek prompt medical attention.