Most headaches in children result from tension, illness, eyestrain, or allergies. If your child suffers from headaches, try to identify the source. Is there a lot of stress in the child's life? Does the child exhibit symptoms of allergies, like a runny nose and watery eyes? Does the child have a fever? If you can't pinpoint the source, and the headaches persist, a thorough physical checkup as well as an eye examination would be a good idea. Headaches don't usually pose a health threat, but there are some signs to keep an eye out for that might need immediate medical attention. For example, seek medical assistance if the headache is accompanied by a stiff neck; if it recurs in the same area; if the headache is severe, sudden, and doesn't go away; or if it occurs with blurred vision, confusion, or a loss of consciousness.