Fitness basics
Learning Center
Allergies
Allergy symptoms can range from mild to severe, even life-threatening. Most allergies can't be cured, but treatments can help.
Rheumatic fever
Learn about this complication of strep throat and scarlet fever and what you can do to prevent it.
Hay fever
Find out more about how to diagnose and get relief from this common condition that can make you feel awful, seasonally and year-round.
Heart rate: What's normal?
A normal resting heart rate for adults ranges from 60 to 100 beats per minute. A heart rate above or below that may signal a problem.
Body lice
Body lice are tiny insects that live in your clothing and feed on your blood. Find out how to treat and prevent this itchy nuisance of a bug.
Mononucleosis
Learn about the symptoms and treatment of the kissing disease in adults and children.
Strep throat
Learn more about the symptoms, causes and treatment of this throat bacterial infection in children and adults.
Triple X syndrome
Females with this genetic disorder have three X chromosomes instead of two. Symptoms can be mild or include developmental delays and learning disabilities.
Infectious diseases
Viruses, bacteria, fungi and parasites can all cause infection. Find out more about how to prevent and treat these conditions.
Malaria
Learn about the symptoms, causes, treatment, and prevention of this infectious disease transmitted to humans through mosquito bites.
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