If the arm pain is obvious after arm wrestling, and if there is a local obstacle to movement, you should pay attention to the possibility of fracture. If there is no obvious obstruction to movement, consider a local muscle or ligament strain. If there is a local obstruction to movement, a routine x-ray is needed to understand whether there are any significant abnormalities in the bones. If there is no fracture, it is a general muscle and ligament strain, and the pain affects the normal rest, you can take appropriate oral painkillers, such as aminoglutethimide, which can help relieve local pain; in addition, you can apply appropriate local heat compresses and massage; you can apply painkilling creams, such as etofenacin gel; pay attention to local rest and avoid exertion, and you can generally recover in 1-2 weeks.