Lungs are mostly symmetrically auscultated during auscultation. Normally, alveolar breath sounds, bronchial breath sounds, and tracheal breath sounds can be heard in the lungs during auscultation. If there are symptoms of pneumonia, there will be rales in the lungs, such as dry rales and wet rales. Alveolar breath sounds are the normal breath sounds heard in the lungs and are the result of air movement through the bronchioles and alveoli, and can be heard in most lung fields. Bronchial breath sounds are characterized by a strong, high-pitched tone during expiration and a low-pitched tone during inspiration, with a loud, low-pitched tone near the airways. In normal people, bronchial breath sounds are mostly found in the larynx, the sternal stalk. If the patient has symptoms such as inflammation, rales can be heard in the lungs. Wet rales, also known as blister sounds, are the sound of water bubbles bursting as airflow passes through the trachea and bronchial tubes that contain thin secretions. If the patient has excessive secretions in the bronchi, a distinct wet rumble can be heard on auscultation. Dry rales are produced by turbulence when air is inhaled or exhaled due to narrowing or partial blockage of the bronchial tubes and trachea. Dry rales are heard when inflammation of the airways, such as the bronchial tubes, causes congestion of the mucous membranes or thick secretions. Lung auscultation needs to be performed by a medical professional in order to make an accurate and effective diagnosis.