In general, eating watermelon doesn't significantly affect patients with bronchitis.

However, for some chronic bronchitis, if it recurs in winter, it is generally not recommended to eat watermelon. Since watermelon is considered a cooling food, eating it during winter when bronchitis flares up can be problematic. During these flare-ups, patients often experience various clinical symptoms such as fever, repeated coughing, coughing up phlegm, shortness of breath, and chest tightness, and because watermelon is inherently cold, consuming it during an inflammatory episode in winter might hinder early recovery from the disease. In contrast, if bronchitis occurs in summer, like in this patient's case, eating watermelon can be appropriate as it not only replenishes needed hydration but also helps reduce heat and other related symptoms such as coughing and yellow phlegm, making it beneficial for managing chronic bronchitis during a summer flare-up.