Concussion is a mild type of cranial trauma, typically characterized by temporary disturbances in consciousness, such as a coma not exceeding half an hour, along with retrograde amnesia, meaning the inability to recall specific details of the incident. Patients may experience lower blood pressure, pale complexion, as well as symptoms like dizziness, headache, nausea, loss of appetite, tinnitus, blindness, lack of concentration, and memory decline. Most concussion symptoms appear immediately after the injury, and there is usually no latent period.