For a three-year-old child, severe nighttime coughing with phlegm, leading to nausea and vomiting, if treatment for bronchitis is ineffective, it may be necessary to consider cough variant asthma and adopt asthma treatment methods. This condition requires systematic treatment and should prevent recurrence after recovery. It is recommended to use bronchodilators to alleviate symptoms and pay attention to daily protective measures, such as adding clothing, avoiding allergenic foods, and keeping the indoor environment clean.