Sudden, severe headache
Weakness or numbness on one side of the body
Trouble speaking or understanding speech
Confusion or unusual behavior
Loss of balance or coordination
Sudden vision changes
Seizure
Nausea or vomiting
Drowsiness or difficulty waking up
Fainting or loss of consciousness
Neck stiffness
Unequal pupil size
Face drooping
Arm weakness
Slurred speech
Sudden trouble walking
Sudden sensitivity to light
Symptoms after a head injury
Seek emergency medical care immediately if these symptoms occur