If you suffer from asthma, then you know that having a cold on top of the condition can be dangerous, if not downright deadly. Therefore, if you feel a cold or flu coming on, with congestion building in your chest, it is essential to cut through that phlegm and mucus, and get it out of your system. Ginger is a well known expectorant, which can cause you to caugh out any excess phlegm or mucus that may be accumulating in the airways. This will prevent a “wet” cough, which can be very hard to manage for someone whose respiratory health has already been compromised by asthma.