The term 'breathing sound' can refer to two different sounds: rale and SNORE. Rale is a medical term for a crackling sound heard when a person breathes, usually caused by fluid in the lungs. SNORE is a sound made when a person breathes during sleep, often caused by an obstruction in the airway. Both of these sounds can be indicative of a medical condition and should be discussed with a doctor if they are heard.