A three year old child has been coughing at night or in the early hours of the morning for a month with phlegm. It may be bronchitis, bronchial asthma and other diseases. It is recommended to go to the hospital for examination and treatment. 1. Acute bronchitis: mostly caused by viruses, bacteria and other bronchial mucosal infections, can be accompanied by cough, cough sputum, fever and other symptoms. Such as viral infections can take antiviral oral solution and other drugs, bacterial infections caused by the use of cefixime, amoxicillin and other antibiotics, cough and sputum can also be used to use aminobromine, acetylcysteine and other drugs such as nebulizer inhalation relief. 2. Bronchial asthma: the most common chronic respiratory disease in children, its onset and children’s own immunity, genetics and so on. Symptoms are mainly coughing and wheezing, mostly in paroxysmal episodes, heavier at night and early morning. It can be treated with nebulized inhalation of drugs such as budesonide suspension. A three-year-old child who has been coughing at night or in the early morning for a month, accompanied by phlegm, may have other causes. It is recommended to go to the hospital in time to identify the cause of the disease, early treatment, drugs need to be used under the guidance of a doctor.