A sick woman lies on the couch and pinches her nose

First Aid Handbook: Sinus Infections

Have you ever had a cold that just wouldn’t go away and seemed to last for weeks? Or have you ever woken up with a throbbing headache in your forehead or under your eyes? If so, you may have been experiencing “sinusitis” or a sinus infection. The -itis ending on a word, particularly in a medical context, refers to an inflammation or infection of that area or body part.