A person with a mild concussion or traumatic brain injury may experience:

• Headache
• Confusion
• Lightheadedness
• Dizziness
• Blurred vision
• Ringing in the ears
• Tiredness or sleepiness
• A bad taste in the mouth
• A change in sleep habits
• Behavior or mood changes
• Trouble with memory, concentration, attention, or thinking
• Loss of consciousness lasting a few seconds to minutes
• Sensitivity to light or sound
• Nausea or vomiting

A person with moderate or severe concussion or traumatic brain injury may have some of the following symptoms in addition to those listed above:

• Headache that gets worse or won't go away
• Repeated vomiting or nausea
• Slurred speech
• Convulsions or seizures
• An inability to wake up from sleep
• Enlargement of the pupil (dark center) of one or both eyes
• Numbness or tingling of arms or legs
• Loss of coordination
• Increased confusion, restlessness, or agitation
• Loss of consciousness lasting a few minutes to hours

A person who suffers a blow to the head or another trauma that may have caused a TBI should seek medical attention.

Sources

Eunice Kennedy Shriver National Institute of Child Health and Human Development
Brainline.org