In-depth

Cough

An occasional cough is normal and healthy. A cough that persists for weeks signals an underlying problem.

Headache

Most headaches aren't caused by a serious illness, but some could be a sign of a life-threatening condition.

Nasal congestion

Nasal congestion: Causes and when to see a doctor.

Runny nose

Runny nose: What's causing your sniffles?

Jul. 08, 2014

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