Concussion symptoms often develop gradually and are subtle. If your child has a head injury and loses consciousness, call Newport Children's Medical Group to schedule a same-day appointment. If your child hits their head and doesn't show immediate symptoms, keep an eye on them and look for signs, such as: Headache Nausea and vomiting Confusion Dizziness Fatigue Reduced concentration Memory loss Younger children might become more tearful or have more frequent temper tantrums. You might also notice that they lose their balance or changes in the way they play, eat, or sleep.