Stress basics
Learning Center
Early HIV symptoms: What are they?
Early signs of the disease can include fever, fatigue and swollen lymph glands. Learn more.
Easy bruising: Why does it happen?
Get the facts about easy bruising. Learn about causes and find out when it's a sign of a problem.
Flu symptoms: Should I see my doctor?
See a healthcare professional if you are at high risk for complications from flu.
Food allergy vs. food intolerance: What's the difference?
Might you have to swear off milkshakes for good? Follow the symptom clues to find out whether you possibly have a food allergy or a food intolerance.
Frostbite
Learn how to prevent cold injury to the skin when outdoors in freezing temperatures and how to treat and recover from frostbite.
GERD: Can certain medications make it worse?
Certain medicines can make symptoms of gastroesophageal reflux disease (GERD) worse. Learn more.
Green stool
Learn about the possible causes of green stools in adults and infants.
Guide to different tick species and the diseases they carry
Learn about different tick species and some of the diseases they may carry.
Headache
Headache: Symptom — Overview covers definition, possible causes of this painful symptom.
Heart attack symptoms: Know what's a medical emergency
Watch for these heart attack symptoms.
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