The arm and wrist generally refers to the elbow joint, the part of the extension is not straight and pain may be humeral epicondylitis, humeral epicondylitis, rheumatoid arthritis and other diseases. 1. Epicondylitis of the humerus: this disease is a chronic inflammatory injury, usually due to long-term, repeated force activities of the wrist, and also with occupation, age, sports and other factors. Patients often have pain in the lateral elbow, burning and other symptoms, also can be accompanied by a weakened grip, elbow popping and other phenomena, and the patient will also be in the wrist or hard to make a fist and other cases of pain aggravation, which can also appear in the arms and wrists can not straighten the phenomenon of pain. 2. Epicondylitis of the humerus: usually due to repeated forceful grasping, forearm rotation, wrist flexion and other conditions, and also with smoking, obesity, diabetes and other factors. Patients often appear in the elbow joint medial pain, pressure pain and other symptoms, but also in the resistance to rotate forward and wrist flexion aggravated. Some patients can also appear in the arm and wrist can not straighten the situation of pain. 3. Rheumatoid arthritis: the pathogenesis of the disease is not completely clear, mostly secondary to a group of streptococcal infections, and also related to dampness, cold and other factors. Generally to the knees, ankles, elbows, wrists, shoulders and other large joints are mainly involved, patients often appear local redness, swelling, pain, pressure symptoms, some patients can also be manifested as the arms and wrists can not straighten and pain. It is recommended that patients with symptoms of pain in the wrist and arm, to clarify the cause of the disease in a timely manner, and follow the doctor’s instructions to take targeted treatment measures.