Sudden redness, swelling and pain in the little finger can be caused by the following reasons: first, gout, gout can involve a finger or more fingers, often can have redness, swelling, elevated skin temperature and pain in the joints of the little finger, and in severe cases, there will be the formation of gout stone, which should be combined with the patient’s medical history, age, and early blood tests for uric acid as well as X-rays of the hand to diagnose and early treatment. Second, bacterial infection, commonly found in the little finger belly, then there can be redness, swelling, pain in the finger belly, in severe cases, there will be abscess formation, then we need to early checkups, blood tests and take finger MRI, X-ray film to diagnose. Third, tuberculosis, when the joints of the little finger tuberculosis infection can also have local redness, swelling, pain symptoms, serious will have sinus tract formation, then to blood tests to identify the pathogenic bacteria, as well as checking the fingers of the X-ray film, CT, MRI to early diagnosis and treatment.