Sinuses are air-filled cavities located within the cheekbones, around the eyes, and behind the nose.
An inflammation of the sinuses is called sinusitis and can be caused by infection, injury, or allergy. It can be classified as acute (which usually lasts for seven to 10 days) or chronic (which lasts for eight weeks or longer).
A dry climate can dry out the membranes in your nose, causing mucus that’s located in the membranes to dry and get thicker. It’s then more likely to clog your sinuses, resulting in pain and pressure.