# sinus cavities - why? **URL:** \ **Category:** Factual Questions\ **Created:** [November 14, 2001, 1:49pm UTC](https://boards.straightdope.com/t/sinus-cavities-why/93305 "2001-11-14T13:49:21Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![justinh](https://avatars.discourse-cdn.com/v4/letter/j/9fc29f/32.png) [@justinh](https://boards.straightdope.com/u/justinh)\ **Post date:** [November 14, 2001, 1:49pm UTC](https://boards.straightdope.com/t/sinus-cavities-why/93305/1 "2001-11-14T13:49:21Z")
I have sinus problems. My question is why? not why do I have problems but what is the biological use of these cavities? ---
**Author:** ![Duck\_Duck\_Goose](https://avatars.discourse-cdn.com/v4/letter/d/50afbb/32.png) [@Duck\_Duck\_Goose](https://boards.straightdope.com/u/Duck_Duck_Goose)\ **Post date:** [November 14, 2001, 2:11pm UTC](https://boards.straightdope.com/t/sinus-cavities-why/93305/2 "2001-11-14T14:11:39Z")
Google, “purpose sinus cavities”, Hit #1. [http://id.essortment.com/sinustrouble\_nnd.htm](http://id.essortment.com/sinustrouble_nnd.htm) > [@](#): > > The purpose of all of these cavities is a question of debate. Some experts claim that they serve no purpose whatever. Others, though, have identified the following as reasons why we have sinus cavities: > > (1) They lighten the weight of the skull > > (2) They improve the resonance of our voices > > (3) They help to moisten as well as warm the air we breathe > > (4) They help the body to rid itself of waste matter, such as mucous and phlegm You’re welcome. 😃 ---
**Author:** ![Perderabo](https://avatars.discourse-cdn.com/v4/letter/p/a183cd/32.png) [@Perderabo](https://boards.straightdope.com/u/Perderabo)\ **Post date:** [November 14, 2001, 2:36pm UTC](https://boards.straightdope.com/t/sinus-cavities-why/93305/3 "2001-11-14T14:36:34Z")
Here’s what a noted columnist had to say… [Why do we have sinuses?](http://www.straightdope.com/classics/a2_302.html)