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Usually, the infection starts from one side of the maxillary sinus. It can spread through the other sinuses when not treated immediately. Clogged nose can also contribute to the pressure-like pain that he feels behind the nose. The pain around the eyes and the pressure from the cheeks causes blurred vision. When both sides of the maxillary sinus have infection, there is a tendency that vision from both eyes will also become blurry.
Many people confuse a sinus headache with a migraine because pain and pressure in the sinuses, nasal congestion, and watery eyes often occur with migraine. To find out if your headache is sinus or migraine, ask yourself these questions: In addition to my sinus symptoms, do I have: 1  Moderate-to-severe headache.