Traumatic brain injury can have wide-ranging physical and psychological effects. Some signs or symptoms may appear immediately after the traumatic event, while others may appear days or weeks later. Mild traumatic brain injury The signs and symptoms of mild traumatic brain injury may include: Physical symptoms 
Headache
Nausea or vomiting
Fatigue or drowsiness
Problems with speech
Dizziness or loss of balance
 Sensory symptoms 
Sensory problems, such as blurred vision, ringing in the ears, a bad taste in the mouth or changes in the ability to smell
Sensitivity to light or sound
 Cognitive, behavioral or mental symptoms 
Loss of consciousness for a few seconds to a few minutes
No loss of consciousness, but a state of being dazed, confused or disoriented
Memory or concentration problems
Mood changes or mood swings
Feeling depressed or anxious
Difficulty sleeping
Sleeping more than usual
 Moderate to severe traumatic brain injuries Moderate to severe traumatic brain injuries can include any of the signs and symptoms of mild injury, as well as these symptoms that may appear within the first hours to days after a head injury: Physical symptoms 
Loss of consciousness from several minutes to hours
Persistent headache or headache that worsens
Repeated vomiting or nausea
Convulsions or seizures
Dilation of one or both pupils of the eyes
Clear fluids draining from the nose or ears
Inability to awaken from sleep
Weakness or numbness in fingers and toes
Loss of coordination
 Cognitive or mental symptoms 
Profound confusion
Agitation, combativeness or other unusual behavior
Slurred speech
Coma and other disorders of consciousness
 Children's symptoms Infants and young children with brain injuries might not be able to communicate headaches, sensory problems, confusion and similar symptoms. In a child with traumatic brain injury, you may observe: 
Change in eating or nursing habits
Unusual or easy irritability
Persistent crying and inability to be consoled
Change in ability to pay attention
Change in sleep habits
Seizures
Sad or depressed mood
Drowsiness
Loss of interest in favorite toys or activities
