Symptoms of a traumatic brain injury range from mild to severe and can last for hours, days, weeks, or even months. These symptoms may include:

• Not thinking clearly, or having trouble remembering new information.
• Having headaches, vision problems, or dizziness.
• Feeling sad, nervous, or easily angered.
• Sleeping more or less than usual.

If you develop these kinds of symptoms at any time after a head injury—even much later—call your doctor.