The pressure is not necessarily caused by mucus. Part of it is mucus, but mostly it’s caused by the nasal passages getting inflamed. Even when you’re healthy, you have a “high flow” nostril, and a “low flow” nostril. You can check right now by sniffing with them one at a time. Which nostril is which changes throughout the day, but is usually unnoticed. Until you get sick, and the low flow nostril clogs completely.
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