Being able to smell sickness

Maybe this is crazy.

But have you ever been able to smell sickness in someone? Like let's say the person has a bug and has mucus/runny nose and is running fever and you can just smell the sickness on them.

You can smell it on yourself too when you're sick with a sinus infection or whatever.

I have a sinus infection rn and I swear i cant smell anything but my own sick.