Understanding Concussion Testing in Colorado: What Patients and Families Should Know Concussions don't always cause the loss of consciousness. In fact, people may appear normal following an injury. Common signs include nausea, headaches, dizziness as well as sensitivity to light and sounds, trouble concentrating and memory issues and fatigue, changes in sleep and emotional changes. Learn More- https://miro.com/app/board/uXjVHvk0q-c=/?share_link_id=653389293902