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.

Cold sores are small, painful, fluid-filled blisters or sores that appear on the lips, mouth or nose that are caused by a virus. They're ugly. They're painful. And they often hang around for days.

FOR some people, it starts with a scratchy throat followed by a tickly cough. For others, a headache comes first, before a ...

First, you’re not alone. Up to 80% of American adults have the herpes simplex virus (HSV-1), which can cause cold sores (also known as fever blisters), according to Johns Hopkins. The viral infection ...

Q: I have had a few cold sore flare-ups over the past few months after years without getting any. What causes them to come back, and what's the best way to treat them? A: Cold sores are caused by the ...

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Experts said it's tough to know the difference between the two from symptoms alone - so don't self-diagnose. If you have respiratory symptoms, stay at home and get a test to rule out COVID-19, they ...

DETROIT (FOX 2) - Symptoms of the omicron COVID-19 variant may make you think you have the flu or a cold. Dr. Sandeep Sohal, an infectious disease fellow with Beaumont Health, said people are ...

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You've been through winter lurgies and escaped the start of spring free of hay fever. Now you wake up with a sniffle you ...

A runny nose, headache, or sore throat could be symptoms of either COVID-19 or a bad cold. Experts said it's tough to know the difference between the two from symptoms alone — so don't self-diagnose.