When you have sinus problems, they're sometimes caused by a condition called sinusitis. Sinusitis is an inflammation, or swelling, of the sinuses. Sinuses are the air passages behind your cheekbones, eyebrows and jaw.
Chronic sinusitis lasts from several weeks to several months.
Symptoms include pain in the face, head or neck, a runny nose, a cough that's often worse at night, and not feeling well in general. Sinusitis can be caused by infections, allergies or medicines. It can also occur as a result of changes in temperature, air pressure and irritants in the air. A cold can put you at risk of sinusitis. Overusing decongestant nasal sprays, smoking, and swimming and diving may also increase your risk of getting sinusitis.