MD It's OK to have yellow or green snot, but if it persists for seven to 10 days, then you probably should let your doctor know. That may mean that you have developed a bacterial infection, sinus ...

Viruses may cause sinus infections, but they typically cause clear or, less often, light yellow mucus. Viruses that may cause ...

A sinus infection, or sinusitis ... You may notice nasal discharge or mucus that's thick and yellow or green. This discharge can often cause a stuffy nose. It's your immune system's natural ...

This mucus buildup can become thick and encourage bacteria and other germs to build up in your sinus cavity, eventually leading to a sinus infection. A doctor typically asks about your symptoms ...

Most often it means that your nasal passages are irritated and swollen, restricting mucus flow and causing it to dry out. This could be due to a nasal infection or a cold. But dairy products ...

Allergies and the very early stages of a viral infection can cause an overproduction of clear mucus. This can also happen when your body reacts to irritants or pathogens. White mucus is often a sign ...

When bacterial titers exceed 1000 colony forming units per milliliter of mucus ... infection. Acute sinusitis has been defined by the American Academy of Otolaryngology- Head and Neck Surgery as a ...