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A head concussion is the most common form of injury in sports. It occurs when your head strikes an object, such as a ball or another player's body, with enough force to cause your brain to bounce around inside your skull. The blow causes chemical changes and swelling that can disrupt nerve cells and blood vessels in the brain. It's not always easy to identify a head concussion by the symptoms alone because they can vary depending on the person and how severe their injury is. The most common symptom of a head concussion is headache, but other possible effects are dizziness, nausea, vomiting, blurred vision, or trouble with balance. A person can have a concussion without losing consciousness or showing any other outward signs of injury.
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