Rales vs Rhonchi Key Differences in Lung Sounds Explained
Rales are crackling, popping sounds in the lungs that happen when air opens closed alveoli; rhonchi are deeper, snore-like rattles caused by mucus in larger airways.
Because both are heard through a stethoscope, students and even nurses swap the terms when charting. Think of it like mixing up a zipper and a drum—both are noises, but they feel and sound nothing alike once you tune your ear.
Key Differences
Rales are high-pitched, brief crackles at the end of inspiration, often compared to hair being rubbed between fingers. Rhonchi are low-pitched, continuous, and tend to clear with coughing because they shift thick secretions.
Which One Should You Choose?
If the sound is light and crackly, say rales. If it’s coarse and clears after a cough, call it rhonchi. Matching the label guides the right bedside move.
Can a patient have both at once?
Yes—secretions in large airways may create rhonchi, while nearby collapsed alveoli add rales.
Do these sounds change with position?
Rhonchi often shift or lessen when the patient sits up; rales usually stay in the same spot.