Home > Medical > Sinusitis Sinusitis All sections in Sinusitis » Allergies » Sinusitis News » Other Remedies » Related Conditions » Secrets of the Nose Marine microbe to help chronic sinusitis A team of scientists and surgeons are developing a new nasal spray from a marine microbe to help clear chronic sinusitis. Oral steroids don't clear up sinus infections Humans can sniff out old age Sneezing the body's natural reboot Device spots bacteria in ear See All Sinusitis News » Sinusitis Overview 8 quick sinusitis facts How is sinusitis diagnosed? What is sinusitis? How is sinusitis treated? What are the causes of sinusitis? What is Sinusitis? The paranasal sinuses are air-filled cavities inside the bones of the skull. They are located on either side of the nose, behind and between the eyes, and in the forehead; there is also one further back in the head. They probably function to reduce skull weight and to enhance vocal resonance. They also have a protective function. However they may become infected, leading to sinusitis with symptoms such as a blocked nose, post-nasal drip and even sinus headaches. But sinusitis can also be caused by allergens and is often associated with other respiratory conditions. Take Action Quiz Are you eating to control headaches? » Ask CyberDoc » Quiz Am I eating too much sugar? » Subscribe Newsletters » Medicines that changed history Common allergy myths advertisement Advertorials What is a cold? What is nasal and sinus congestion? See All Advertorials » Other remedies An end to sniffles and sinusitis Sinus alert See All Other remedies » Secrets of the nose What is making you sneeze? Unravelling the secrets of the nose Blocked sinuses - visuals See All Secrets of the nose » Allergies World Smoke Free Day 8 allergy myths See All Allergies » Related conditions Sinusitis - from Natural Standard Facial swelling See All Related conditions » Tools Find out: is it a cold, sinusitis or flu? See All Tools » From our sponsors Your retirement - a healthy mindset So many people, why so alone? You can still enjoy the sweet things in life Take the sugar test, it could save your life.