But I don't think it's that unusual. It's that time of the year. We have sinus problems as well. Stop to think about it. It's the noise hairs.
Material goes up into the sinuses and down the throat.
Of course, the air is just one culprit, and a minor one at that, in the never-ending attack on our winter comfort. The worst offender is other people. Keep your immune system in good shape by getting adequate sleep and don't expose yourself to the elements unreasonably. But the number-one cause is being exposed to someone who has that virus. It would be nice if you have a virus to avoid infecting others.