While the sinuses and the inner ear are different systems, they are neighbors. Severe congestion can block the Eustachian tubes, which regulate pressure in your ears. If this pressure throws off your equilibrium (your balance system), you may experience severe vertigo or dizziness. While vertigo itself isn't fainting, the sensation of spinning can be so disorienting that it leads to a fall or a collapse.
It is important to differentiate a common infection from other conditions with "sinus" in the name that do cause fainting: Carotid Sinus Hypersensitivity - Johns Hopkins Medicine can sinus infection cause fainting
: In severe cases, a persistent, violent "sinus cough" can increase pressure within the chest, temporarily interfering with blood flow to the heart and brain, which may cause a sudden blackout. Distinguishing Sinusitis from Other "Sinus" Conditions While the sinuses and the inner ear are
This is an excellent and important medical question. While vertigo itself isn't fainting, the sensation of
If you’ve felt lightheaded or even fainted while battling sinusitis, you aren’t imagining it. While fainting isn't the most common symptom of a sinus infection, the two can be connected.