the.com/sinuses
Hollow head-caves that exist mostly to fill with regret every spring.
means Air-filled cavities in the skull around your nose and eyes that warm air, lighten the skull, and dramatically clog.
from From Latin sinus, meaning a fold, curve, or bay — the same root behind the math sine, because anatomists saw the same graceful hollows everywhere.
Dead weightLighten the skull so your neck works less.
Voice boxResonate sound, which is why colds flatten you.
Slow drainersTiny openings clog easily, hence the pressure.