Symptoms in children Children can develop symptoms of epiglottitis within hours. Symptoms can include: Fever. Sore throat. Unusual, high-pitched sound when breathing in, known as stridor. Difficult and painful swallowing. Drooling. Acting anxious and irritable. Sitting up or leaning forward to ease breathing. Symptoms in adults Adults might get symptoms over days rather than hours. Symptoms might include: Sore throat. Fever. A muffled or hoarse voice. Unusual, high-pitched sound when breathing in, known as stridor. Difficulty breathing. Difficulty swallowing. Drooling.