Pediatric acute laryngitis varies in severity and symptoms. Common symptoms include hoarseness, whole lung coughing, and inspiratory breathing difficulties, as well as other respiratory and gastrointestinal symptoms such as vomiting and diarrhea. Additionally, there may be systemic symptoms like fever. Seizures may occur in children under six years old. If the symptoms of laryngeal obstruction in laryngitis are prominent, the affected child may show signs of listlessness or irritability, inspiratory breathing difficulties, flaring nostrils, and a positive three-concavity sign.