There are several possible causes of finger joint swelling in the morning: first, rheumatism and rheumatoid diseases, when rheumatism and rheumatoid diseases, can appear in the morning when the finger joints are swollen, accompanied by finger joint pain symptoms, then the relevant blood tests and hand x-ray examination, to carry out early diagnosis and treatment; second, tenosynovitis, if a single finger joint swelling, may be due to Second, tenosynovitis, if a single finger joint is swollen, it may be caused by stenosing tenosynovitis, which should be investigated and examined, and if necessary, treated with early closure and surgery; third, ankylosing spondylitis, which can also involve the joints of the fingers in severe cases, often multiple, and can be accompanied by morning stiffness and lumbar pain. In this case, blood tests and X-rays of the fingers and lumbar spine should be performed.