There is no obvious rule on how long to do iodine 131 treatment after surgery, it is mainly decided according to the condition, generally speaking, six months after surgery can be. However, before iodine 131 treatment, the eugenol dose needs to be adjusted at the optimal state, which is very important. As for the requirements of the hospital, this is the same as other disease treatment, which is certainly relevant. For the examination before treatment, the routine examination can be done in other hospitals, but the 6 items of nail function are required to be examined in our hospital, which is closely related to the treatment and is very important.