Rales Lung Sounds

Introduction

Welcome to our rales page. On this page we provide a definition of rales, including its clinical significance. We then compare rales against rhonchi with audio recordings and text. Finally, there is a link to the rales training lessons available on this site.

Our rales lesson can be found in this course. Secondly, our reference index is designed to provide quick access to rales sounds, with audio tracks, listening guides and waveforms. Use this link for quick reference to heart and lung sounds.

Definition

Rales are abnormal lung sounds characterized by discontinuous clicking or rattling sounds. They can sound like salt dropped onto a hot pan or like cellophane being crumpled.

These popping sounds are created when air is forced through airways that have been narrowed by mucus, pus or other fluids. Rales are frequently associated with inflamed or infected small bronchi, bronchioles, and alveoli.

Crackles and rales mean the same thing. Refer to our 'crackles' page for more information on fine vs coarse crackles, along with patient recordings for each.

Crackles may be heard in the respiratory cycle during inspiration or expiration.

Rales Lung Sounds

Rales Listening Tips

Listen for crackles, which are discontinuous, popping sounds similar to Velcro being pulled apart.

Rales Causes

When alveoli suddenly pop open with the presence of secretions, rales sounds are thought to be produced.

Audio Playback

patient torso with stethoscope chestpiece

The patient's position should be seated.

The following recordings provide examples of what rales sounds like.

Waveform

Compare To Rhonchi

Rhonchi Listening Tips

Listen for lower pitched, snoring or rattle-like sounds.

The patient's position should be seated.

Respiratory Sounds Reference Guide

Our auscultation reference guide quick access to a description of rales lung sounds as well as many other adventitious sounds. Each sound is described also with an audio recording and waveform.

Lung Sounds Reference Guide

Free Course Covering Rales

Our basic course on lung sounds, free with registration (no credit card needed) presents two lessons on rales along with many other commonly heard breath sounds.

Quick Links to Other Breath Sounds

While we have many breath sound lessons and quick references on this website. Please use the links below.

Vesicular Breath Sounds
Bronchial Breath Sounds
Adventitious Breath Sounds
Adventitious Lung Sounds
Wheezing
Rhonchi
Fine and Coarse Crackles
Rales
Egophony
Auscultation Lung Sounds Audio

Related Lessons

Basics of Lung Sounds
The goal of this basic course in lung sounds is to improve auscultation observational skills. We focus on describing important breath sounds and in providing recordings of each. Many students find that waveform tracings aid in learning lung sounds; we have included dynamic (moving cursor) waveforms with each lesson. The anatomy pages use illustrations to reveal an example of each lung sound (anatomy not yet available on smartphones).

Lesson List

1	Vesicular - Normal
2	Crackles - Fine (Rales)
3	Crackles - Coarse (Rales)
4	Wheeze
5	Rhonchi - Low Pitched Wheezes
6	Bronchial
7	Pleural Rubs
8	Bronchovesicular

Intermediate Lung Sounds
The goal of this intermediate course is to expand your observational skills when auscultating breath sounds. The course lessons include voiced sounds: bronchophony, egophony and whispered pectoriloquy. We also provide auscultation lessons on several types of wheezes, crackles and stridor. Each of these lung sound lessons includes audio, text and dynamic waveform. The anatomy pages use illustrations to reveal an example of each lung sound (anatomy not yet available on smartphones).

Lesson List

1	Vesicular - Diminished
2	Bronchophony - Healthy
3	Bronchophony - Abnormal
4	Egophony - e
5	Egophony - a
6	Whispered Pectoriloquy - Healthy
7	Whispered Pectoriloquy - Abnormal
8	Wheeze - Expiratory
9	Wheeze - Monophonic
10	Wheeze - Polyphonic
11	Crackles - Early Inspiratory (Rales)
12	Crackles - Late Inspiratory (Rales)
13	Stridor

Authors and Reviewers

Heart sounds by Dr. Jonathan Keroes, MD and David Lieberman, Developer, Virtual Cardiac Patient.
Lung sounds by Diane Wrigley, PA
Respiratory cases: William French
David Lieberman, Audio Engineering
Heart sounds mentorship by W. Proctor Harvey, MD
Special thanks for the medical mentorship of Dr. Raymond Murphy
Reviewed by Dr. Barbara Erickson, PhD, RN, CCRN.
Last Update: 11/10/2021