According to PDRhealth, the frontal sinuses are positioned above the eyes; when irritated, they cause swelling above the eyebrows; the medical word for this illness is sinusitis. Sinuses are air-filled cavities within the facial bones surrounding the nose.
There are four major sinuses: frontal (above the eyes), maxillary (inside the cheekbones), ethmoid (behind the bridge of the nose), and sphenoid (behind eyes). According to Bupa, inflammation of the sinuses produces swelling and the trapping of air and mucus, which leads in pain and a feeling of being clogged up.
Acute sinusitis can last up to four weeks and is caused by an infection of the mucous membranes, such as during a cold. If the mucus becomes infected with bacteria, bacterial sinusitis is the outcome.
Chronic sinusitis is characterised by a duration of greater than 12 weeks and is triggered by irritants and allergens. Pollen, dust, smoke, pollutants, and household detergents are examples of irritants and allergens. Sinusitis is characterised by pain on the crown of the head, within the ears, the upper jaw and teeth or cheeks, and between the eyes. Other symptoms include a stuffy nose, a diminished or absent sense of smell, green or yellow mucus that drips from the back of the throat, and a fever. Less common symptoms include fatigue, a cough or sore throat, and poor breath.