A child’s morning and evening cough should be related to a hyper-reactive, allergic cough of the airways. The main causes of allergic cough are as follows: 1. Contact with allergens, such as contact with toxic plants, metals, chemical dyes, paints, etc. can lead to the above symptoms. 2. Contact with allergic foods, such as milk, protein, seafood, milk powder, various food additives, etc. 3. Inhaled allergens, such as animal fur, pollen, oil smoke, perfume, and dust mites, molds, etc. can also cause Allergic coughing can also be caused by mosquito bites or bee stings, or by the use of allergy-inducing drugs. In addition to allergies, mycoplasma infections are also seen in children, but mycoplasma infections also have systemic symptoms, such as fatigue, elevated body temperature, and swollen lymph nodes.