What is bronchitis

What is Bronchitis?

Bronchitis is a respiratory condition involving inflammation of the bronchi, the tubes carrying air from the trachea to the lungs. This inflammation causes airway swelling, increased mucus production, and difficulty moving air through the respiratory tract. The condition manifests primarily through a persistent cough, which may last several weeks. Bronchitis can be acute, developing suddenly after infection, or chronic, persisting over extended periods.

Acute Versus Chronic Bronchitis

Acute bronchitis typically follows a viral respiratory infection, developing within days of initial symptoms. It usually resolves within 2-3 weeks as the immune system clears the infection. Chronic bronchitis, by contrast, persists for months or years and represents one component of Chronic Obstructive Pulmonary Disease (COPD). Chronic bronchitis involves persistent cough and mucus production on most days of the month for at least three months annually.

Causes and Risk Factors

Viral infections cause the majority of acute bronchitis cases, including influenza, respiratory syncytial virus (RSV), and coronavirus infections. Bacterial infections cause fewer cases but can occur secondarily. Smoking represents the primary risk factor for chronic bronchitis development. Additional risk factors include air pollution exposure, occupational dust or chemical inhalation, weak immune systems, and repeated respiratory infections. Age and seasonal variations also influence bronchitis frequency.

Symptoms and Diagnosis

The hallmark symptom is a persistent cough lasting over two weeks, often beginning dry and progressing to productive cough with mucus. Other symptoms include fatigue, shortness of breath, mild fever, chest discomfort, and wheezing. Diagnosis is primarily clinical, based on symptom history and physical examination findings. Chest X-rays differentiate bronchitis from pneumonia, while lung function testing may assess severity in chronic cases.

Treatment and Management

Acute bronchitis treatment focuses on symptom management since viral cases resolve independently without antibiotics. Supportive care includes rest, hydration, cough suppressants, and expectorants. Chronic bronchitis management involves smoking cessation, bronchodilator medications, inhaled corticosteroids, and pulmonary rehabilitation. Prevention through vaccination, avoiding respiratory infections, and air quality improvement reduces bronchitis risk and severity.