What causes catarrh?

Catarrh may be caused by many things for example after a cold when the membranes of the nose and throat are irritated excess mucus can form causing nasal catarrh high up in the airways and bronchial catarrh lower down. Chronic catarrh may form with o  www.natural-healing-cures.com

Sorry, I don't know the answer to that question. Teach us the fact to answer this Adding a fact will enable us to answer this question, along with many others. For example, adding a person's birth date will not only let us know when their birthday is  www.trueknowledge.com