Patients in the clinic in the head by the impact, there may be no impact, may also have a greater impact, the specific problem must be combined with the actual judgment, as follows: 1, no impact: some people relative tolerance is relatively good, the patient is young, even if there is an impact will not produce obvious problems, may occasionally appear transient coma, but often on the brain substance will not produce obvious impact, so there will be no special 2, the impact of a larger: some, such as the elderly, the physical quality of the relatively poor, even a relatively small force impact on the brain tissue, may cause a variety of adverse reactions, such as cerebral hemorrhage, cerebral contusion, diffuse axonal injury and so on a series of situations, and even some may also directly endanger the life, so be sure to combine with the head CT to clarify the specific changes in the situation, so that the most accurate.