Pain in the little finger of the right hand for no apparent reason may be caused by trauma. If the patient strains the tendons of the little finger during prolonged strenuous exercise, it may cause swelling and painful symptoms in the joint. Patients with rheumatoid arthritis may also experience pain in the little finger. Patients with rheumatoid arthritis can experience morning stiffness due to damage to the synovial membrane of the finger joints, which can lead to stiffness in the finger joints, and may also experience swelling and pain in the joints, and in severe cases, can cause deformity of the finger joints, resulting in impaired joint movement. It is necessary to apply anti-inflammatory and pain-relieving medications to treat the symptoms and relieve the pain, and apply heat to promote blood circulation and reduce swelling and pain. If the symptoms still do not improve or are accompanied by other symptoms, a hospital examination is needed to rule out rheumatoid arthritis and other diseases.