A concussion is a type of brain injury that can happen after a hit, fall, or other impact, even when you did not lose consciousness. Symptoms vary, but many people report headaches, dizziness, nausea, confusion, memory trouble, blurred vision, or fatigue. Your symptoms can also involve balance, sleep, mood, and concentration. You cannot self-diagnose this from a checklist, you need a clinician to connect the symptom pattern to your history and exam. If you have severe or sudden symptoms, seek emergency care. Book an appointment online or call the clinic.