The index finger is medically known as the index finger, and the pain in the first joint bump of the index finger is considered to be related to arthritis of the finger, gout, bone fracture, rheumatoid arthritis, and so on. 1. Finger arthritis: it refers to the joint disease that occurs in the finger, mostly in the distal interphalangeal joints, the patient will have hyperplastic nodules in the inflammatory stage, accompanied by pressure pain, swelling, activity limitation and other symptoms, which may lead to the appearance of the first joint of the index finger protruding pain. 2. Gout: patients may experience sudden severe pain in one or more finger joints, accompanied by redness and swelling of the joints. This may lead to the development of pain in the first joint of the digit. 3. Fracture: Partial or total disruption or loss of integrity or continuity of bone or cartilage tissue, deformity, dysfunction, etc., mainly due to trauma, skeletal diseases, etc., may lead to the appearance of the first joint of the first joint of the finger bump pain. 4. Rheumatoid arthritis: mainly due to autoimmune disorders, infections, heredity, etc., often showing morning stiffness, swelling and pain in the joints of the hands and feet, and in severe cases, joint deformities may occur, which may lead to the emergence of pain in the first joint of the first finger. When the first joint of the digit is raised and painful, it is necessary to pay attention to it, and it is recommended to choose to consult a doctor in time.