Acute bronchitis generally refers to acute inflammation of the central airways that is usually self-limited and associated with near-complete healing within 4 to 8 weeks. viral infections are the most common cause, especially in the winter, but other factors such as air pollution, irritant fumes, and smoke exposure may also produce acute bronchitis. The infectious causes are often spread by aerosol inhalation to other close contacts.
This video explains more about acute bronchitis.
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