The lining of the nose becomes swollen causing obstruction of sinus drainage. The result is accumulation of mucous secretion in the sinus cavity that becomes secondarily infected by bacteria or several bacterias. Typical bacteria which cause sinusitis are often the same which cause ear infections. They include S. pneumoniae and other sreptococci, H. influenzae, S. aureus , M. catarrhalis . Pain can radiate or refer to the upper incisors and canine teeth via nerves which line the floor of the sinuses.
Maxillary sinusitis can result from a dental infection.
Tender teeth should be examined for abscess. Discolored nasal discharge and poor response to over the counter decongestants may also suggest sinusitis. Headache, in the front and middle of the head. Some experience overall body aches, fatigue, fever, bad breath, post nasal drip. Although it is often possible to make a diagnosis of sinusitis on clinical grounds alone, radiological confirmation allows a more definitive diagnosis and is an objective monitor of the course of infection.