What is the best way to get rid of excess mucus formation in the lungs?

To know the cause: Mucus formation, more than a disease itself, it is a response of your body to something could be injuring your respiratory system. It is important to make a medical assessment to determine the most probable cause. Anyway, a good hydrate state is helpful to produce thinner and softer mucus, which is easier to expulse. If mucus tend to be bloody, a medical consult is required ASAP.