What is sinusitis? Posted on December 31, 2018March 8, 2023 by 0 Vote Up Vote Down Ask A Doctor Staff asked 4 years ago What is sinusitis? 1 Answers 0 Vote Up Vote Down Ask A Doctor Staff answered 4 years ago Sinusitis is an inflammation or infection of the sinus cavities, which are located around the nasal passages. Usual symptoms include increased nasal secretions and pain or headache around the sinuses. Please login or Register to submit your answer Username or Email Address Password Remember Me