It's a question that's been puzzling people for years: does a sinus infection cause brain fog? While there's no definitive answer, there are several theories as to why this might be the case.
One theory is that the pressure caused by a sinus infection can lead to decreased blood flow to the brain, which in turn can lead to foggy thinking. Another possibility is that the infection itself can invade the brain, causing inflammation and resulting in cognitive problems.
There is also some evidence that certain medications used to treat sinus infections, such as antibiotics and decongestants, can have a negative impact on cognitive function.
So if you're experiencing signs of brain fog, such as difficulty focusing or concentrating, confusion, memory problems or feeling tired all the time, it might be worth talking to your doctor about whether you might have a sinus infection.