Determining the severity of right lower lung inflammation in children requires a comprehensive judgment based on specific systemic symptoms. First of all, it is not a serious condition. If the lesion of right lower pneumonia is small, the child does not have a persistent high fever, a violent cough, no significant respiratory acceleration or difficulty in breathing, and the child’s diet is fine, then it is not serious. If the lesion of right lower pneumonia is large, the child has a persistent high fever, poor mental status, poor appetite for food, violent coughing, and even respiratory distress such as a significantly faster respiratory rate and trigeminal signs, then the condition is more serious.