Sudden pain in the ring finger of the left hand may have the following causes: first, gout, when gout involves the finger joints, there can be sudden pain in the ring finger joints, which can be accompanied by skin redness and swelling and increased skin temperature, and there can be the formation of gouty stones, then blood uric acid tests should be performed for early diagnosis and early treatment; second, rheumatoid and osteoarthritis, when there are rheumatoid and osteoarthritis and other aseptic inflammatory diseases, there can also be pain in the finger joints. Second, rheumatoid and osteoarthritis, when there are rheumatoid and osteoarthritis and other aseptic inflammation, there can also be pain in the finger joints, often when exertion or cold pain is more obvious, then the relevant blood tests and hand x-ray for examination and treatment; third, tenosynovitis of the fingers, when there is stenosing tenosynovitis of the fingers can also occur when there is sudden pain on the palmar side of the finger joints, then the relevant examination and examination for early diagnosis, if necessary If necessary, surgical treatment or closure treatment should be performed.