The inability to straighten the elbow joints in rheumatoid arthritis patients may be due to the progression of the rheumatoid arthritis disease itself, resulting in patients with limited joint movement and difficulty in joint movement. Rheumatoid arthritis is an autoimmune disease that mainly involves the peripheral joints and causes symmetric, erosive polyarthritis symptoms as the main clinical manifestations, which mainly causes morning stiffness, joint swelling and pain, and with the progression of the disease, the patient may develop joint deformity and joint movement restriction. Joint deformity and limited joint movement mainly appear in the late stage of rheumatoid arthritis, and in severe cases, it can lead to disability. Patients with this kind of condition need to follow the doctor’s instructions to maintain anti-rheumatic drugs, such as methotrexate, cyclophosphamide and other medications, and should also be given surgical treatments depending on the specific circumstances in order to rectify the deformity of the joints and to improve the quality of life. It is recommended that rheumatoid arthritis patients with symptoms such as inability to straighten the elbow joints should go to the rheumatology department of a regular hospital for relevant consultation and treatment as prescribed.