hi, thank you for your query. Yes a fever can be a sign of a concussion. The common symptoms of concussion in children are- headache,dizziness,vomitting,irritability,loss of balance and change in eating patterns,fever. The American Academy of Pediatrics recommends that you call your child s doctor for advice if your child receives anything more than a light bump on the head. If your child remains alert, moves normally and responds to you, the injury is probably mild and usually doesn t need further testing. -Look to see if pupils are the relatively the same size. If the pupils don t respond or one pupil is huge and doesn t respond that is a sign of a brain injury. -Also feel the skull for holes in the skull. -If there is a soft spot the skull is fractured. fever is an emergency symptom of concussion,hence i would advise you to consult a peadiatrician once to start medication. he would advise for X-ray or a CT to look for bleed and fracture and complete blood picture to look for any infection. the earlier the medication is started the better. thank you, wishing you good health