Chronic sinusitis occurs when the sinuses - which are spaces inside of your nose and head - become swollen or inflamed, causing symptoms for more than three months. Again, sinuses are cavities or spaces in the skull that are used to regulate the flow of air, create mucus, and improve lubrication. Sinuses have a mucus lining that serves to trap foreign particles before they can pass any farther into the body. Sinusitis occurs when the sinus linings become infected or inflamed, causing excessive mucus production. When this mucus gets infected, you'll experience discoloration with the yellow and green discharge. Chronic sinus infections can get better, can get worse, but most of the time do not improve over time.
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