Children who fall on their head can be clarified by clinical symptoms, imaging, and clinical examination to determine whether a concussion is present. If there are post-injury consciousness disorder, forgetfulness of recent events, etc., and there is no obvious damage on CT and no obvious functional impairment on physical examination, concussion should be considered. 1. Clinical symptoms: Generally, patients with concussion will have dizziness, headache, nausea and vomiting, forgetfulness of recent events, and transient consciousness disorder after injury, and in some cases, numbness and weakness of limbs and speech dysfunction may occur. 2. Imaging examination: head CT or head nuclear magnetic testing does not show some damage to the brain substance, such as no cerebral contusion, cerebral hemorrhage and other changes. 3. Clinical examination: Clinical examination does not reveal obvious weakness of limb movement and speech dysfunction. It is recommended that the patient should consult a doctor in time, and actively diagnose and treat under the guidance of the doctor, so as to avoid delaying the condition.