A head CT scan for concussion usually does not show organic changes, as it primarily stems from temporary dysfunction of brain neurological functions. The main symptoms include brief disturbances in consciousness, retrograde amnesia, and some patients may also experience a series of clinical symptoms such as headaches, dizziness, nausea, and vomiting. For patients with concussion, what we need to do is a head CT scan or an MRI of the head to rule out organic brain lesions. The second option is to examine the cerebrospinal fluid. The third option is to conduct an electroencephalogram (EEG) test.