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Sinusitis or sinus infection is inflammation of the air cavities within the passages of the nasal cavity. Tiny holes that connect your nasal passages to your sinuses get blocked. It can be caused by a number of factors including colds and flu viruses, infection, polyps, allergies, and irritants. If your sinuses cannot drain properly it causes inflammation and swelling around the nasal area. This can directly affect your breathing, cause pain, irritation, and headaches and affect your day to day living.