Bronchitis
Bronchitis is an inflammation of the lining of the bronchial tubes, which carry air to and from the lungs. When these tubes are irritated, they swell and fill with sticky mucus, making it harder to breathe and causing a persistent cough.
Overview
Bronchitis is an inflammation of the lining of the bronchial tubes, which carry air to and from the lungs. When these tubes are irritated, they swell and fill with sticky mucus, making it harder to breathe and causing a persistent cough.
The condition is generally categorized as either acute or chronic. Acute bronchitis is very common and often follows a respiratory infection, while chronic bronchitis is a more serious, long-term condition frequently caused by smoking.
Understand this condition
Inside your lungs, the air passages become red and swollen during an episode of bronchitis. This inflammation triggers the production of excess mucus to trap irritants. The body then uses a cough reflex to try and clear this blockage.
Why it happens
Bronchitis usually begins when a virus or irritant enters the bronchial tubes and damages the lining. The immune system responds with inflammation, causing tissues to swell and produce thick fluid. If the irritant remains, such as cigarette smoke, the damage can become permanent.
Real-world scenarios
- •This often appears as a hacking cough after a head cold.
- •People may notice clear, yellow, or green mucus when they cough.
- •This often feels like tightness or minor soreness in the chest.
- •People may feel unusually tired while recovering from the initial infection.
Common vs serious explanations
- •A lingering cough after a viral cold
- •Normal body response to clear mucus from the lungs
- •Temporary irritation from cold, dry winter air
- •Mild airway sensitivity following a flu infection
- Pneumonia, an infection deep in the lung tissue
- Congestive heart failure causing fluid in the lungs
- Pulmonary embolism, a blood clot in the lung
- Lung cancer causing persistent airway irritation
- Chronic Obstructive Pulmonary Disease (COPD) progression
Symptoms
Click any symptom to analyzeCauses
- •Viral infections like the common cold or flu
- •Bacterial infections (less common)
- •Cigarette smoke and secondhand smoke exposure
- •Airborne pollutants such as dust or chemical fumes
- •Chronic gastric reflux irritating the airways
Risk factors
- •Current or former cigarette smoking
- •Exposure to secondhand smoke or wood smoke
- •Weakened immune system from illness or age
- •Frequent exposure to dust or chemical irritants
- •Untreated or poorly managed gastric reflux (GERD)
- •Lack of certain vaccinations like the flu shot
How it progresses
3 stages- OnsetSymptoms appear, often triggered by a known cause.Often missed
- Active phaseSymptoms peak; self-care or short treatment usually helps.
- ResolutionSymptoms ease over days to weeks with proper care.
How it's diagnosed
- •Clinical evaluation by a healthcare professional
- •Review of medical history and symptoms
- •Targeted physical examination
- •Laboratory or imaging tests when indicated
Treatment options
General educational information only — no dosage advice. Always follow guidance from a qualified clinician.
- •Over-the-counter cough suppressants for nighttime relief
- •Pain relievers to reduce fever and body aches
- •Prescription bronchodilators to open tight airways
- •Getting plenty of rest to support immune recovery
- •Drinking fluids to thin out lung mucus
- •Using a humidifier to moisten the air
- •Avoiding smoke and other lung irritants
Complications
- •Heart strain
- •Reduced oxygen delivery
- •Risk of cardiac event
- •Recurrence of bronchitis
Prevention
- •Wash hands frequently
- •Avoid close contact with infected people
- •Stay up to date with vaccines
- •Don't smoke
- •Stay physically active
- •Manage blood pressure and cholesterol
When to seek help
- •Symptoms persist beyond a few days
- •Symptoms interfere with daily activities
- •New or worsening symptoms appear
- •Concerning changes related to bronchitis
- Difficulty breathing or severe shortness of breath
- Coughing up blood or blood-tinged mucus
- A high fever over 102 degrees Fahrenheit
- Bluish tint to the lips or fingernails
- Chest pain that worsens with deep breaths
- Confusion or sudden mental status changes
In any emergency, call your local emergency number or go to the nearest emergency department.
Real-world questions
- ›Can Bronchitis feel like a heart attack?
- ›Can Bronchitis cause headaches?
- ›Is Bronchitis reversible?
- ›How quickly does Bronchitis progress?
- ›Is Bronchitis hereditary?
Compare conditions
Explore related symptoms
Frequently asked questions
Possible causes of Bronchitis include Viral infections like the common cold or flu, Bacterial infections (less common), Cigarette smoke and secondhand smoke exposure, Airborne pollutants such as dust or chemical fumes.
Bronchitis is generally moderate, but severity can vary. Seek care if symptoms are severe or persistent.
Duration varies between individuals. Many cases improve with appropriate care, while others may persist longer and require ongoing management.
Some milder cases may improve with rest and self-care. If symptoms persist or worsen, consult a healthcare professional.
Consider seeing a clinician if symptoms are severe, persistent, worsening, or if you have any concerns related to general.
Sources
Information based on general medical references such as:
Last reviewed: May 2026