Wheeze and Noisy Breathing

People often use the word wheeze for several different breathing noises. A clinician may need to hear the sound and assess the whole breathing pattern. Severe breathing difficulty requires urgent action even when the sound is faint or absent.

Noisy breathing is a description Noisy breathing means that airflow or breathing effort is creating an extra sound. The sound may come from the nose, throat, central airway, smaller chest airways or lungs. People do not always use respiratory sound names in the same way. A reported wheeze may actually be stridor, stertor, crackles or another noise. The sound provides useful evidence, but it does not identify the cause by itself. Clinicians interpret it with age, onset, breathing effort, associated symptoms and examination findings. What clinicians mean by wheeze Wheeze is a continuous musical or whistling sound produced by airflow through narrowed airways within the chest. It is often louder during breathing out. Wheeze can also occur during breathing in or throughout both phases. Its timing does not map the narrowing to one exact airway or establish a diagnosis. A widespread, multi toned wheeze may occur with variable airway narrowing. A single toned or one sided wheeze can suggest more local narrowing, but neither pattern confirms the cause. Asthma, chronic obstructive pulmonary disease and viral induced wheeze can all produce wheeze. Babies with bronchiolitis may have wheezing or crackling sounds. Other causes include inhaled material, anaphylaxis and fluid congestion from heart failure. The likely explanation depends strongly on age and the surrounding pattern. What clinicians mean by stridor Stridor is a harsh, high pitched sound caused by narrowing in the upper or central airway. It is often loudest over the neck and heard during breathing in. Stridor can also be heard during breathing out or throughout both phases. The phase gives a clue about the level of narrowing, but it is not an exact locator. New stridor needs prompt clinical assessment. Upper airway narrowing can worsen quickly, especially when the sound occurs at rest or breathing effort is increasing. Croup is a common cause of stridor in young children. A typical pattern includes a barking cough, hoarse voice, cold like symptoms and a rasping sound during breathing in. Other causes include an inhaled object, anaphylaxis, infection or swelling around the airway, and structural or movement problems affecting the voice box. Other breathing noises also matter Stertor is a low pitched snoring or congested sound from the nose or back of the throat. It differs from the higher pitched sound usually called stridor. Crackles are short popping or crackling sounds, usually heard through a stethoscope. They can occur with fluid, infection or changes affecting small airways and air sacs. Grunting is a short sound made during breathing out. In a baby or child, grunting can be a sign of increased breathing effort and requires prompt assessment. Quiet breathing is not always reassuring. Severe asthma or exhaustion can reduce air movement, so wheeze may become faint or disappear while the person becomes more unwell. The onset and associated symptoms change concern Sudden wheeze or stridor after choking raises concern about an inhaled foreign body. One sided wheeze or reduced breath sounds can support this possibility, but examination may sometimes be normal. Sudden noisy breathing with swelling of the lips, tongue or throat can indicate anaphylaxis. Tightness in the throat, difficulty swallowing, faintness or a widespread itchy rash add further concern. A cold followed by cough, rapid breathing, feeding difficulty and wheeze or crackles can fit bronchiolitis in a baby. Pauses in breathing or marked effort are emergency features. Recurring wheeze with cough, breathlessness or chest tightness can suggest asthma. Symptoms may vary with exercise, cold air, allergens, infections, work exposures or time of day. Wheeze alone does not confirm asthma. Current NICE guidance requires a symptom pattern suggesting asthma and a supporting objective testing when the person's age and condition allow it. Examination assesses sound and severity A clinician first looks at breathing effort, alertness, skin colour and the ability to speak, feed or drink. They measure respiratory rate, pulse and oxygen saturation when appropriate. They listen over the neck and chest during breathing in and out. The loudness of a sound does not measure the degree of obstruction reliably. The clinician also checks whether the sound is widespread or localised. They consider fever, drooling, swallowing difficulty, cough, voice change, swelling and any choking event. A normal oxygen saturation does not identify the cause or exclude important airway narrowing. A normal examination between episodes also does not exclude asthma. Tests answer targeted questions Typical mild croup and bronchiolitis are often diagnosed from the clinical pattern. Routine imaging is not required for every child with these conditions. When asthma is suspected, tests may include FeNO, spirometry, bronchodilator reversibility or peak flow monitoring. Each test measures a different feature and must fit the symptoms and background. Spirometry measures airflow. Bronchodilator reversibility checks whether airflow improves after an airway opening medicine. FeNO measures a marker linked with some types of airway inflammation. Objective asthma tests can be difficult in children under five. NICE recommends treatment and regular review, followed by objective testing when the child can perform it. Suspected foreign body inhalation may require urgent specialist assessment. Imaging can help in some cases, but a normal image does not always exclude an inhaled object. Stridor that is severe, atypical or persistent may need specialist examination of the upper airway. The method depends on the person's stability and the suspected cause. What may happen after assessment Treatment depends on the cause and severity rather than the sound name alone. The first priority is maintaining a safe airway and supporting breathing when someone is acutely unwell. A person with diagnosed asthma should follow their personal asthma action plan. They should use their prescribed reliever inhaler as directed and seek help if it does not work. A clinician may give a steroid medicine for croup to reduce airway swelling. Do not put a child with croup in a steamy room or make them inhale steam. Anaphylaxis needs immediate adrenaline and emergency assessment. Use an adrenaline auto injector immediately if one has been prescribed, then call 999. When to get help Call 999 for severe breathing difficulty, gasping, choking or an inability to speak or feed because of breathlessness. Also call 999 for blue, grey or very pale skin, confusion, collapse or reduced responsiveness. Call 999 for sudden throat or tongue swelling, throat tightness or difficulty swallowing. Use an adrenaline auto injector immediately if anaphylaxis is suspected and one is available. For an asthma attack, call 999 if symptoms worsen, do not improve after the maximum reliever dose in the action plan, or no inhaler is available. Do not drive to A&E. For a child, call 999 for marked breathing effort, grunting, pauses in breathing, colour change, unusual quietness, limpness or difficulty waking. Drooling with swallowing difficulty also requires emergency help. Contact NHS 111 or seek an urgent clinical assessment for new stridor without current emergency features. Seek urgent assessment after a significant choking episode followed by ongoing cough, wheeze or noisy breathing. Arrange a GP review for recurring wheeze, persistent noisy breathing or symptoms that disturb sleep or normal activity. New wheeze in an adult also requires assessment rather than an assumed asthma diagnosis. This lesson explains how clinicians describe and assess noisy breathing. It cannot identify the cause of an individual sound or replace urgent medical help.

Wheeze, stridor and other breathing noises provide clues about airflow and airway location. They are not diagnoses, and sound loudness does not reliably show severity.