Sinusitis is caused by anything that irritates the lining of the nose over long time period and causes the mucous membrane to swell. The most common sinusitis causes are grass and tree pollen, cold air, alcohol, perfumed, dumped weather, allergy to house dust, mite mould and fungi and snorting. People who have allergy based asthma often have sinusitis attacks. Infact, any problem with the nose that blocks the drainage holes can produce sinusitis. This can include polyps, deviated nasal septum, tooth and gum infections, swimming, air pollution and smoking. Some of the important symptoms of sinusitis are frontal sinusitis, it causes pain above the eyebrows and the forehead may be tender to touch. Maxillary sinusitis causes aching in the upper jaw, teeth and cheeks. Inflammation of the sphenoid sinusitis can cause earache, neck pain or an ache behind the ears or temples. Stuffy nose, thick yellow or green discharge from the nostrils, cold symptoms, foul smell in the nose, temperature, wea