I want to determine the specific reason why the arm is not straight, because there is obvious pain in the process or simply not this action, these two are essentially different. If the pain is simply because of the feeling of not straight, is too much exercise in the process of fitness, muscle strain, strain, should rest for a period of time as far as possible, external use of blood, blood stasis, pain relief of Yunnan Baiyao aerosol, as well as oral fenbid, with hot compresses, physical therapy, etc., adhere to about half a month should be better. But if there is no movement at all, it may be in the fitness process of a violent role is too large, resulting in this part of the muscle rupture, we must go to the hospital orthopedic examination, serious may have to be surgical sutures and external fixation protection to be able to recover.