Đi khám bác sĩ ngay cả khi có triệu chứng nhẹ. Lưu ý hiện tượng ho nhiều. Lắng nghe âm thanh khi thở ra. Lưu ý hiện tượng hụt hơi bất thường. Lưu ý hiện tượng thở nhanh. Không bỏ qua triệu chứng cảm lạnh hoặc cảm cúm.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Early symptoms aren't serious enough to interfere with your normal activities or daily life. When the condition starts to progress, though, you'll notice yourself having trouble with normal activities. People usually continue to experience the early symptoms, but more severely. If left undiagnosed or untreated, the early, mild symptoms of asthma can get progressively worse. This is especially true if you don't identify your triggers and avoid them. If you have asthma, your airways can get closed