Concussion symptoms can show up immediately, or they can build over several hours as your nervous system becomes more sensitive. Common early signs include:
• Headache or pressure in the head
• Dizziness or balance problems
• Nausea
• Sensitivity to light or noise
• “Brain fog,” slowed thinking, or feeling mentally drained
• Trouble concentrating or remembering details
• Irritability, anxiety, or mood swings
• Sleep changes (sleeping more, less, or feeling unrefreshed)