A concussion affects brain function. Changes in brain activity may evolve over time, depending on the severity of the impact, your individual response, and whether you continue routine activities too soon after the injury.
Some symptoms, such as dizziness, confusion, or headache, can emerge within minutes. Others, like sleep disturbances, mood changes, or trouble concentrating, may not surface until later.
It’s possible to feel fine initially and notice changes in thinking, balance, or behavior several hours after the impact. For some people, symptoms become more noticeable 24–72 hours later.
This delayed onset can make it difficult to recognize the seriousness of the injury right away.
Pay close attention to your body in the hours and days following a head injury. Even if you feel okay right after the incident, avoid strenuous activity and stay alert for any signs of cognitive or physical changes.
Symptoms like persistent headache, nausea, blurry vision, memory loss, or mood changes should not be ignored, even if they appear late.
It’s important to note that symptoms can come and go or fluctuate in intensity. This doesn’t mean you’re imagining them — it reflects the brain’s ongoing recovery process.
Early recognition and rest are critical to preventing further complications.
Take actionIf you’ve recently hit your head, monitor yourself closely for at least 72 hours. Seek medical attention if any symptoms develop, even if they seem mild or delayed.