The specific reaction caused by the impact on the back of the head must be evaluated in the light of the actual situation, as follows: 1. No reaction or reaction soon relieved: Because some people may not feel anything after the impact in the clinic, the relative impact force is relatively small, and the patient’s physical quality is relatively good, there is no reaction in this case, or only occasional headache or dizziness, but it will soon be relieved significantly. 2.Serious reactions: Some people may suffer frontal lobe hemorrhage, brain contusion or occipital fracture after the impact, some people may also produce skull base fracture, etc., so the condition is more serious, need to improve the head CT, head nuclear magnetic in order to finalize the clear, even in special cases, may also form venous sinus thrombosis, etc., so it is recommended that clear examination, so that the diagnosis can be better. This is the only way to better confirm the diagnosis.