The emergency department often encounters cases like this – children who fall from high places or fall/bump their heads on their own. The parents rush to bring him/her to the hospital for examination. And they ask for a CT examination. So, should CT examination be done? Routinely, CT examination after head trauma is a good way to clarify whether there is serious trauma such as intracranial hemorrhage or skull fracture in a timely and effective manner. However, because CT has a higher radiation dose than general X-ray examination, generally speaking, minor head trauma can be observed first before deciding whether further CT examination is needed. If the child is in good spirits or not depressed, drowsy, or irritable compared to usual, and there is no violent vomiting (some children may vomit once or twice after crying and quarreling, but not violently), it indicates that the intracranial injury is mild, so the child can be observed for 4-6 hours first, and if he or she still performs well, the observation can be continued for about 3 days. If the above symptoms appear at any time during the observation, CT should be examined promptly to clarify whether there is intracranial injury so that timely intervention can be made.