Some kind of obstruction in the throat or nasal passage can lead to persistent coughing and difficulty breathing. They can occur due to increased phlegm in the lungs. The phlegm is a substance that is secreted by the respiratory tract’s mucous membrane and it is responsible for fighting infections. When it is accumulated in the chest and throat, the body expels it through coughs. Increased presence of phlegm can result in runny nose, difficulty breathing, persistent cough, fever and weakness. It may block the bronchial tubes and cause problems that are hard to be treated with conventional medications. But there are many natural remedies that can reduce the phlegm amount and treat the infection effectively and easily.