According to WebMD, there are four main categories for concussion symptoms: thinking and remembering, physical, emotional and mood, and sleep. The first category includes not thinking clearly, feeling slowed down, troubles concentrating and forgetting new information.
The physical symptoms include nausea, vomiting, headache, blurry vision, dizziness, sensitivity to light or sound, balance issues, and fatigue says WebMD. The third category symptoms are being easily upset or angered, feeling sad, nervous or anxious, and being more emotional in general. Finally, sleep symptoms are sleeping more or less than usual or having difficulty falling asleep. Healthline states that those who suffered a concussion may also have a slowed reaction to stimuli.