It is very likely that the symptoms of fever in the joints are due to the following diseases: first, the most common disease that can cause this symptom is arthritis, especially acute arthritis, and it is common to see fever in the joints where inflammation occurs. Arthritis can also be induced by excessive activity, exercise, or maintaining a fixed joint angle for a long period of time, as well as by sudden cold stimuli or prolonged moist stimuli. As these unfavorable factors act on the joints, they can cause inflammatory substances to seep out of the joints, and once the inflammatory substances have accumulated to a certain level, acute joint inflammation can be induced. In addition to the symptoms of joint fever, there will be joint pain, swelling, local redness and other manifestations. Second, acute synovitis will also appear joint fever symptoms, synovium in the human body joints in the distribution of a wide range of joints, many joints have synovial structure, once due to external stimuli lead to inflammation of the synovium, will also appear joint fever performance.