Concussion in children is a transient brain dysfunction caused by trauma to the child’s head, usually lasting between a few minutes and half an hour, and children can have more severe reactions to trauma because of the imperfect development of the nervous system. In older children, there is a persistent headache and vomiting, nervousness, and retrograde amnesia, which means that the clinical manifestations of older children are usually similar to those of adults, with a brief rise in consciousness accompanied by hypotonia and active tendon reflexes. In younger children, the transient impairment of consciousness is not obvious, and there is often a delayed neurological deterioration, manifested by subsequent nausea, vomiting, dizziness and drowsiness, lethargy, coma, etc. The younger the child, the more pronounced this manifestation is. In children with concussion, diffuse brain swelling, decreased muscle strength, and positive Babinski’s sign on neurological examination can occur. These manifestations usually recover gradually within 12 hours after the injury, but in severe cases, diffuse brain swelling can occur and even be life-threatening. Therefore, it is important to pay enough attention to concussion in small children, and once it occurs, it is recommended to stay in the hospital for 1-2 days for observation, and then discharge after excluding the dangerous period. Once a child suffers a traumatic brain injury, he or she must be highly alert to the occurrence of concussion and stay in the hospital for 1-2 days for observation if necessary to prevent serious adverse reactions.