Fitness basics
Learning Center
Cholera
Cholera is a treatable — yet potentially fatal — bacterial disease that causes diarrhea and dehydration. Learn how to lower your risk.
Brugada syndrome
Learn about the symptoms, causes and treatments for this heart rhythm condition that is sometimes inherited.
Heart palpitations
Know when and how feelings of a rapid, fluttering or pounding heartbeat are treated.
MRSA infection
MRSA infections often occur in health care settings, but they can happen anywhere. Find out about symptoms and treatment for this virulent staph infection.
Sick sinus syndrome
This heart rhythm disorder causes slow, paused or irregular heartbeats. Learn the symptoms and how it's treated.
Vocal cord dysfunction: Is it a type of asthma?
Vocal cord dysfunction and asthma cause similar symptoms, but they're not the same. Find out the difference between the two.
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.
Dermatomyositis
Muscle weakness and a skin rash are hallmarks of dermatomyositis. There's no cure, but treatments can relieve symptoms.
Primary immunodeficiency
Frequent infections could mean you have an immune system disorder. The conditions in this category are usually caused by genetic changes.
Livedo reticularis: When is it a concern?
Learn when this condition that causes a lacy pattern on the skin is simply a result of being chilled or something more serious.
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