Pain in the right index finger may be a precursor to the following diseases: 1. Gouty arthritis, which may cause severe pain in the interphalangeal joints of the right index finger, accompanied by redness, swelling and heat on the joint surface. 2. This symptom suggests the possible existence of tendon pathology in the right index finger, such as the possible existence of trigger finger. This type of disease is often caused by excessive movement of the index finger, resulting in inflammation of the tendon on the palmar side of the right index finger, which may produce abnormal ringing, unfavorable movement, and severe pain when it passes through the narrow tendon sheath. 3. Injury to the interphalangeal joint ligaments may result in subluxation of the joint. When moving the index finger, there will be a very obvious pain in the interphalangeal joint.4. Fatigue injury caused by overuse of the right index finger is often seen when the patient holds a pen for a long time, which causes fatigue injury to the right index finger, resulting in pain in the right index finger.