Definition of Sinusitis

Starting from now on I will use term sinusitis to replace resdung which is in malay.

Sinusitis is an inflammation of the nasal sinuses. It is usually caused by infection (bacterial or viral), but can also be caused by allergic reactions or other responses to environmental agents.

So you will hear terms like rhinitis, rhinosinusitis, rhinopharyngitis etc. Most of the time it will start with rhinitis - you sneezing, nose itchy, nasal dripping, nose block and the later on will involve your sinususes then you will start complain of headache, facial pain. When your sinus involved, this where we call it as sinusitis or resdung.