Bronchitis is an inflammation of the bronchial tubes, the airways that carry air to your lungs. It often develops from a cold or other respiratory infection and is categorized as either acute or chronic. Acute bronchitis is more common and usually resolves within 10 days, though the cough may linger. Symptoms include coughing up mucus, wheezing, shortness of breath, and fatigue. Chronic bronchitis, a more serious condition, involves persistent coughing with mucus most days for at least three months, two years in a row, and is often caused by long-term exposure to irritants such as tobacco smoke or air pollution. Treatment focuses on relieving symptoms and improving lung function.
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