Sinusitis is a common condition when the lining of the sinuses becomes inflamed and swollen. often caused by a viral infection it can also be triggered by allergies and often improves within a few weeks.
The sinuses are small, air-filled cavities behind your cheekbones and forehead; their function is to warm the the air that you breath through the nose.
The mucus produced by your sinuses usually drains into your nose through small channels. In sinusitis, these channels become blocked because the sinus linings are inflamed (swollen).
Chronic rhino-sinusitis is a very common condition affecting 10% of the UK adult population. It is associated with significant reduction of quality of life, frequent visit to the Gp, and some missed days at work.
Diagnosis is made by the presence of two or more persistent symptoms for at least 12 weeks, one of which should be nasal obstruction and/or nasal discharge, and/or facial pain/pressure or loss of sense of smell.
in chronic rhino-sinusitis it is essential to check the presence or absence of nasal polyps.
If you develop chronic sinusitis after an acute sinus infection, you may continue to get symptoms even though the infection has gone. (This is why treating chronic sinusitis with antibiotics does not often work.) After being initially triggered by an infection, the persisting symptoms may be due to a combination of factors. For example:
Poor drainage of the affected sinus - the sinus drainage channel may become fully or partially blocked.
A build-up of mucus in the sinus.
Inflammatory changes to the lining of the sinus that result from infection or some allergies
A flare-up of infection from time to time as a result of these changes.
Sometimes, a persisting allergy can cause inflammation in a sinus and swelling or blockage of the drainage channel.