There are a few reasons we have sinuses. Sinuses are lined with mucus, so they help keep our noses moist.ii Other functions of the sinuses include: Enhancing the voice Protecting the face from trauma Insulating the nose against temperature changes Filtering out the dust and microorganisms from the airiii The sinuses are an important component of our respiratory health. However, they are easily impacted by our environment, leading to symptoms like runny nose, congestion, and headaches. Below, you’ll find information on common sinus problems and how to identify the signs.