| Respiratory |
| What causes black mucus? Black mucus or phlegm is usually a sign of an underlying condition, smoking, or exposure to pollutants. It may clear up on its own, but it sometimes requires treatment. Here, find out what causes black mucus and how to treat it. |
| How to tell if a sore throat is from an allergy or a cold Allergies can cause cold-like symptoms, so it can sometimes be difficult to tell whether a sore throat is due to an allergy or a common cold or the flu. Learn how to tell the difference here. We also cover treatment and prevention. |
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