In TODAY.com's Expert Tip of the Day, a doctor reveals the important clues about your health that can be found in your snot.

Sinuses are interconnected, hollow spaces located in the skull that connect to the nasal passages. They help filter the air we breathe and act as another level of immune defense. Sinuses are lined ...

Morning nasal congestion can signal allergies, sinusitis, dry air, GERD, or structural nasal issues. ENT experts say that ...

It’s that time of year again, when everyone’s fighting a cold and blowing their nose. Maybe you’ve found yourself having sinus struggles, or you’ve noticed your boogers don’t look “normal.” Whatever ...

Dear Doctors: Can you please talk about sinusitis? I’ve been having headaches and postnasal drip for a few months, and I thought it was because of my allergies. But my brother, who is a nurse, thinks ...

A patient's mucus may predict the type of his or her chronic sinusitis, which could help doctors determine whether surgery or medical treatments can produce the best outcomes, according to a recently ...

When, before I became a father, I saw my grandmother suck mucus out of the nostrils of babies I little realised that, some day, I, too, as a parent, would help relieve nasal congestion in my babies in ...

Your head is full of holes. No, really, it is. Not just your nostrils, mouth and ear openings, there are also big openings behind the nose, inside the face. Called sinuses, these chambers are "empty ...

A sinus infection (sinusitis) is caused by a virus or (sometimes) bacteria that creates swelling in the nasal passages. Oftentimes, sinus infections come with or after a viral upper respiratory ...

DEAR DOCTORS: I saw my dentist for pain in an upper molar, but the X-ray was normal. My nose was also plugged up, and she said it might be my sinuses. I started doing a saline rinse, and after a few ...

You know it's not the flu because no one else is sick, and you know it's not a cold because you had that last week. So what's causing that killer headache and the feeling that your nose is locked in a ...