What is Sinus: Sinus is a nasal disease or it can be said that it is a respiratory disease, in which the nose bone increases and then that person gets cold and then there is difficulty in breathing as well as headache. The person who has sinuses starts suffering from cold air, dust, and smoke. It is also called sinusitis. Infection in the sinuses causes swelling of the nasal membranes and accumulation of mucus in them, making breathing very difficult.
