When a child has a cough that is always bad, the first step is to find out why the cough is always bad and treat the cause in order to cure it. At this time, it is important to take your child for a chest plain film to observe if a serious infection in the lungs has occurred, leading to severe pneumonia and bronchitis. If it is indeed caused by an infection, hospitalization is required for anti-infective treatment. If the cough is prolonged, it is often a bacterial infection and can be treated with intravenous drips of ceftriaxone, cefoperazone, and penicillin antibiotics for anti-inflammatory purposes; mycoplasma infection cannot be ruled out, and if it is a mycoplasma infection, it will be positive for mycoplasma antibodies and can be treated with intravenous drips of azithromycin and erythromycin. If the cough is always bad, you also need to use cough and phlegm relieving drugs, such as aminoglutethimide oral solution and pulmonary cough combination. Another reason, there is a possibility of cough variant asthma, which is often an irritating dry cough. You need to check the bronchodilator test, and if diagnosed, you need to give your child long-term nebulized inhalation medication for treatment, which can effectively relieve the cough, you can give your child nebulized inhalation budesonide and terbutaline.