Common colds and flsu are typical during the winter months. A healthy person shouldn’t be worried about these illnesses; they can actually strengthen the immune system if you chose to ride them out. If you are suffering from chronic sinusitis or bronchitis, however, that’s another story. People with chronic sinusitis or bronchitis are normally very vulnerable to infections; medical treatment is difficult. You can first go to your doctor and request a chest auscultation. You can also take an X-ray image of the sinuses to exclude chronic sinusitis.