Allergy signs and symptoms in children can be mild to severe. Symptoms will vary depending on the allergen and the exposure of the child to that allergen. Common symptoms of allergies include sneezing, runny nose, sniffing, itching, watery eyes, swelling, coughing and potentially vomiting. Sensitivity of the lungs, nose, skin or mouth can be symptoms of more severe allergic reactions and can be life-threatening in severe cases where the airway swells, causing the body to go into anaphylactic shock and cutting off the ability to breathe. If you think your child is suffering from an allergic reaction, it is important to get them checked out by a health care professional who can determine if it is a reaction and if further testing should be done to determine the cause.