If your child has the following symptoms, think of possible allergies: 1, nasal symptoms: perennial itchy nose, sneezing, runny nose, aggravated by cleaning the room, may be dust mite allergic rhinitis; seasonal appearance of symptoms, may be spring or summer and fall pollen caused by hay fever. 2, respiratory symptoms: frequent episodes of breathlessness, wheezing, dyspnea, to consider allergic asthma; seasonal or repeated coughing after a cold, may be allergic cough, or cough variant asthma. 3, eye and ear symptoms: eye itching, redness and swelling, ear itching, repeated water in the external ear canal, may be allergic conjunctivitis, external ear eczema. 4, skin symptoms: pediatric skin redness, rash, rough and flaky, to consider may be allergic toddler eczema. Skin large air masses, itching, may be different causes of acute / chronic urticaria. Redness, rash and pain on the face after contact with a particular substance may be atopic dermatitis. 5.Systemic Symptoms: Sudden onset of generalized rash, chest tightness, abdominal pain, dizziness or even shock during walking or other exercise after meals may be food-dependent-exercise-induced anaphylaxis. 6, other: after eating seafood, fruits, lips, redness, swelling and itching, or even a full-body rash, may be seafood or fruit and other food allergies; pets at home, often feel itchy eyes, nasal congestion, suffocation, it may be pet dander allergy; there are also drug allergies, insect sting allergies.