Acute Bronchitis: Symptoms, Causes and Treatment

Introduction

Acute bronchitis is short-term swelling of the bronchi, which are the large airways in the lungs [1,3]. It often starts during or after a cold or flu-like illness [1,5]. Many people call it a “chest cold” [2].

A lasting cough is the main symptom [3,5]. The cough may start dry and later bring up mucus [2,5]. Other symptoms may include tiredness, congestion, sore throat, and mild body aches [2].

Most simple cases improve within one to three weeks without specific treatment [3,5]. However, the cough may last for several weeks [5,6]. Viruses cause most cases, so antibiotics usually do not help [1,2,4].

This guide explains acute bronchitis symptoms, causes, treatment and when to see a doctor. It also covers signs that may point to pneumonia or another serious illness.

Overview: What Is Acute Bronchitis?

Acute bronchitis is inflammation of the bronchi without signs of pneumonia [3]. The bronchi carry air into and out of the lungs [1,6]. “Acute” means the illness began recently and should last for a short time [1].

The condition is common and often occurs with a viral infection [1,3,5]. In most healthy people, it gets better on its own [4,5]. Treatment mainly focuses on easing symptoms while the airways heal [4,5].

How acute bronchitis affects the airways

The bronchi have a lining that can swell when it becomes infected or irritated [1,6]. The swollen airways may also make more mucus [1,2]. Coughing helps the body clear this mucus from the airways [8].

Swelling may narrow the airways and make breathing feel harder [1]. Some people also notice a tight or uncomfortable feeling in the chest. Major breathing problems may point to another condition and need medical care [10].

Acute bronchitis often begins as an infection in the nose, sinuses, or throat [1]. It may then spread to the airways that lead to the lungs [1]. Cold viruses are common causes of this airway swelling [1,5].

Acute bronchitis does not include pneumonia [3]. Pneumonia is a different illness that may also cause cough and breathing problems [7,10]. A clinician may need to rule it out when symptoms are severe or unusual [7,10].

Acute bronchitis versus chronic bronchitis

Acute bronchitis begins suddenly and lasts for a limited time [1,6]. Chronic bronchitis is a long-term condition with ongoing airway swelling and irritation [1,6]. It is not the same as one short bout of a chest cold.

Chronic bronchitis involves a cough with mucus on most days for at least three months [1]. Smoking is a major source of long-term airway irritation [6]. Chronic bronchitis needs medical care and long-term management [6,8].

Repeated bouts of bronchitis also deserve medical review [6,8]. Lasting or repeated symptoms may point to chronic bronchitis or another lung problem [6,8]. Asthma and chronic obstructive pulmonary disease, called COPD, can also cause cough and breathing trouble [7,10].

How long does bronchitis last?

People often ask, “How long does bronchitis last?” Most simple cases improve within one to three weeks [3]. Some people feel better within 7 to 10 days, but the cough may last for weeks [6].

A cough can remain after other cold symptoms are gone [4,5]. This does not always mean the infection is still active. The airways may need more time to recover from swelling and irritation [5,8].

This usual recovery time applies most closely to healthy people without major health problems [2,5]. A cough that lasts longer than expected should be checked by a clinician [6,10]. Medical review is also wise if the cough keeps getting worse [10].

Symptoms of Acute Bronchitis

Acute bronchitis symptoms often look like those of a common cold [2,5]. Nose, sinus, or throat symptoms may occur before the cough begins [1]. The cough is often the most noticeable symptom [3,5].

Symptoms commonly include cough with or without mucus, tiredness, congestion, and sore throat [2]. Mild body aches can also occur [2]. Some people may have wheezing or discomfort from repeated coughing.

Cough, mucus, and chest discomfort

The main symptom is a cough that may or may not bring up mucus [2,3]. It is often dry at first [5]. Later, it may become a wet cough that brings up phlegm [5].

“Phlegm” and “sputum” are other words for mucus from the lungs. Mucus may become thick or change color during bronchitis [6]. Green or yellow mucus does not reliably prove that bacteria caused the illness.

Mucus color alone cannot tell a viral infection from a bacterial infection. It also does not prove that antibiotics are needed. A clinician looks at the whole illness rather than mucus color alone.

The cough may be strong enough to disturb sleep [2]. Swollen airways and mucus can also make breathing feel less comfortable [1]. Severe trouble breathing is not a routine sign and needs urgent medical review.

Cold-like symptoms and fatigue

Common acute bronchitis symptoms include:

• A dry cough or a cough with mucus [2,3]
• Tiredness or low energy [2]
• Congestion [2]
• A sore throat [2]
• Mild body aches [2]

These symptoms often occur because bronchitis develops with a viral breathing infection [1,5]. The nose and throat symptoms may improve before the cough does [4,5]. A stubborn cough can remain even when the person feels better [5].

The illness may affect each person in a different way. People with heart or lung disease may not follow the usual pattern [2,10]. They may need advice earlier in the illness.

Symptoms that may suggest another illness

Several health problems can look like acute bronchitis. These include pneumonia, influenza, COVID-19, pertussis, asthma, COPD, and heart failure [10]. Pertussis is the infection also known as whooping cough.

A high or lasting fever may suggest an illness other than simple bronchitis. Severe shortness of breath or worsening chest pain also needs prompt review. A chest X-ray can help find pneumonia when a clinician suspects it [7].

Testing may be needed when flu or COVID-19 could explain the symptoms [10]. A clinician may also consider pertussis when a cough lasts longer than expected [10]. Routine tests are not needed when symptoms clearly fit simple acute bronchitis [10].

Severe breathing difficulty needs emergency care. Blue or gray lips, confusion, or fainting are also emergency warning signs. Coughing up blood or having severe chest pain requires urgent medical evaluation.

Causes, Risk Factors, and Prevention

Viruses cause most cases of acute bronchitis [1,2]. These are often the same viruses that cause colds and other breathing infections [1,5]. Bacteria can sometimes cause bronchitis, but this is much less common [1,2].

Smoke and other irritants may also inflame the airways [8]. These exposures can make coughing and airway swelling worse [6,8]. Avoiding known irritants is an important part of recovery.

Viruses and less common bacterial causes

Cold viruses often inflame the bronchi [1,5]. The illness may start in the nose, throat, or sinuses [1]. It can then move into the larger airways [1].

Influenza and COVID-19 can also cause an acute cough [10]. A clinician may consider these infections based on symptoms and possible exposure [10]. Testing is not routine unless another cause is suspected [10].

Bacteria sometimes infect the airways, but this is uncommon [1,2]. A bacterial cause may be more likely in someone with COPD [1]. Even then, mucus color alone cannot confirm a bacterial infection.

Pertussis is another possible cause of a long-lasting cough [10]. A clinician may test for it when the cough has an unusual pattern. Testing may also be useful when symptoms last longer than expected [10].

Smoke and other airway irritants

Smoke can irritate the airways and contribute to bronchitis [8]. Smoking can also cause the long-term airway swelling linked with chronic bronchitis [6]. Ongoing smoke exposure may make cough and irritation harder to manage.

Avoid smoke while the airways recover. It is also sensible to avoid other substances that clearly make breathing worse. Severe breathing trouble after an exposure needs prompt medical assessment.

Repeated bronchitis-like symptoms may point to ongoing irritation [6,8]. They may also be a sign of chronic bronchitis or another lung condition [6,8]. A clinician can assess for asthma, COPD, or other causes [7,10].

Reducing the risk of respiratory illness

Most cases begin with a viral breathing infection [1,2]. Reducing close contact with people who are ill may lower exposure to these viruses. Avoiding tobacco smoke can help reduce airway irritation [6,8].

People with long-term health problems should ask a clinician about their personal risk. They may also need advice sooner if a cough or breathing problem develops [2,10]. People with weak immune systems may need a more careful assessment [2,10].

Diagnosis and Treatment of Acute Bronchitis

Acute bronchitis is usually a clinical diagnosis [10]. This means a clinician can often diagnose it from the symptoms and an exam. The main goal is to rule out pneumonia and other causes of cough [7,10].

Routine diagnostic testing is usually not needed [10]. Tests may be ordered if pneumonia, flu, COVID-19, or pertussis is possible [10]. Testing may also help when asthma, COPD, or heart failure could explain the symptoms [7,10].

How a clinician evaluates a persistent cough

A clinician may ask when the cough began and whether it brings up mucus. The clinician may also ask if symptoms are improving or getting worse. During the exam, the clinician listens to the lungs with a stethoscope [7].

A chest X-ray may help show pneumonia or another cause of cough [7]. It may be more important for people who smoke or have smoked in the past [7]. A mucus test may help find an illness that could respond to antibiotics [7].

A lung function test measures how well air moves through the lungs [7]. This test may help when asthma or another airway problem is possible [7]. The choice of tests depends on the symptoms, exam, and health history.

Routine testing is usually unnecessary in a simple case [10]. However, a clinician may test for influenza or COVID-19 when either illness is suspected [10]. Pertussis testing may be considered for a cough with an unusual or lasting pattern [10].

Home care and symptom relief

Most simple cases get better without specific medical treatment [4,5]. Rest can make it easier to cope with tiredness. Avoiding smoke may prevent more airway irritation [6,8].

Many people do not need medicine for acute bronchitis [4,5]. Some medicines may ease symptoms, but few change the course of the illness [4]. Evidence for many common cough treatments is limited [4,10].

A recent review did not support routine use of cough suppressants for acute bronchitis [10]. It also did not support antihistamines or oral anti-inflammatory pain medicines [10]. Routine use of inhaled or oral corticosteroids was not supported either [10].

Corticosteroids are drugs that reduce inflammation. They may still be used for another condition when a clinician thinks they are needed. Treatment is different when asthma or COPD is causing the breathing symptoms [7,10].

Fluids and moist air are often used as comfort steps. These measures should not delay care for serious warning signs. Ask a clinician or pharmacist before mixing several cold or cough products.

Why antibiotics are usually not recommended

Antibiotics treat bacterial infections, not viruses. Viruses cause most cases of acute bronchitis [1,2]. Therefore, antibiotics usually do not help people with a simple chest cold [2,4].

Antibiotics do not provide meaningful overall improvement in uncomplicated acute bronchitis [10]. They may shorten the cough by only about half a day [10]. This small possible benefit does not support routine antibiotic use [10].

Antibiotics may also cause side effects [10]. Their unneeded use can add to antibiotic resistance [10]. Antibiotic resistance means bacteria change and become harder to treat.

A clinician may prescribe an antibiotic when another bacterial illness is found. Discolored mucus alone is not enough to show that antibiotics are needed. The full set of symptoms and exam findings matter more than mucus color.

Do not use leftover antibiotics for a new cough. Do not take medicine prescribed for another person. Seek medical advice when symptoms are severe, unusual, or last longer than expected.

When to See a Doctor for Acute Bronchitis

Most healthy adults can recover with time and basic care [2,5]. However, warning signs can point to pneumonia or another serious problem [7,10]. Some people also need medical advice sooner because they have a higher health risk [2,10].

Emergency warning signs

Seek emergency medical help for:

• Severe breathing difficulty
• Blue or gray lips
• Confusion
• Fainting
• Severe or lasting chest pain
• Coughing up blood

These signs require urgent medical evaluation. Do not wait for a routine visit if breathing is severely limited. Emergency services may be the safest choice for sudden or severe symptoms.

Reasons to schedule a medical visit

Contact a clinician if a fever is high or lasts longer than expected. Seek advice if symptoms improve and then become worse. A cough that lasts longer than the usual recovery period should also be checked [6,10].

Medical review is important when pneumonia may be present [7,10]. A chest X-ray can help confirm whether pneumonia explains the cough [7]. Other tests may be used when flu, COVID-19, or pertussis is suspected [10].

Asthma, COPD, and heart failure can also cause cough or breathing trouble [10]. These problems may need treatment that differs from acute bronchitis care [7,10]. A clinician can use the exam and tests to look for these causes [7,10].

Contact a clinician for signs of dehydration or trouble drinking enough fluid. Coughing up blood also requires prompt medical evaluation. Severe chest pain or major breathing trouble should be treated as an emergency.

People who may need earlier evaluation

People with chronic heart or lung disease may need care sooner [2,10]. The same is true for people with a weakened immune system [2,10]. Pregnant people and adults of advanced age may also need earlier clinical assessment.

Young children with a major cough or breathing trouble need timely medical advice. General guidance for adults may not apply to infants or small children. A clinician can assess risk based on age, history, and symptom severity.

Ask for medical advice if you are unsure about your risk. Early contact is wise when breathing changes or symptoms keep getting worse. It is also important when the illness does not follow the expected course.

Conclusion

Acute bronchitis is short-term inflammation of the bronchi without signs of pneumonia [3]. Viruses cause most cases [1,2]. Common symptoms include cough, tiredness, congestion, sore throat, and mild body aches [2].

Most simple cases improve within one to three weeks [3]. The cough may last longer than the other symptoms [5,6]. Acute bronchitis treatment usually focuses on time and supportive care [4,5].

Antibiotics do not offer meaningful overall improvement in simple acute bronchitis [10]. They can cause side effects and add to antibiotic resistance [10]. Mucus color alone does not prove that an antibiotic is needed.

Knowing acute bronchitis symptoms, causes, treatment and when to see a doctor can guide safer choices. Severe breathing trouble, blue or gray lips, confusion, or fainting require emergency care. Coughing up blood or having severe chest pain also needs urgent evaluation.

People with chronic heart or lung disease may need care sooner [2,10]. This also applies to people with weak immunity, pregnancy, or advanced age. Seek medical help if symptoms are severe, unusual, or last longer than expected.