GOV.WALES uses cookies which are essential for the site to work. Non-essential cookies are also used to tailor and improve services. By continuing to use this site, you agree to our use of cookies.
Definition: Sinusitis is a common condition in which the lining of the sinuses becomes inflamed.
Context: Mae angen i ymdrechion i wella presgripsiynu ganolbwyntio'n benodol ar heintiau'r pibellau anadlu isaf ac uchaf, heintiau'r llwybr wrinol, llid y glust ganol a llid y sinysau.