Clinically, patients with moderate concussion have conventional symptoms, retrograde amnesia, short time coma and hemiplegia, etc., as follows: 1. conventional symptoms: patients will have headache, dizziness, nausea and vomiting; 2. retrograde amnesia: that is, forgetting what happened at the time of injury, often with a time span of a few minutes or seconds, and not forgetting long-term memory, such as their names; 3. short time coma The time of coma is usually within half an hour and does not last long, and subsequent patients are often awake on their own, so they must be evaluated in the context of the patient’s actual condition; 4, hemiplegia: in some cases, patients may also have a transient limb hemiplegia, or a transient convulsion, but it is important to clarify the patient’s own condition in order to better evaluate.