The question of when bronchitis can be dangerous is frequently asked. Bronchitis that develops at any age can lead to potentially serious consequences if appropriate treatment is not started in a timely manner and exposure to triggering factors continues. Particularly, bronchitis poses a higher risk and has a greater likelihood of leading to serious complications in children under 3 years old, individuals using immunosuppressive drugs, and people over 65 years old. In these groups, additional attention and close monitoring are crucial.