Articles In This Section
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A to Z: Aortic Stenosis
In aortic stenosis, the aortic valve is narrower than it's supposed to be and can't open all the way.
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A to Z: Ataxia Telangiectasia
Learn about this genetic disorder that can weaken the immune system and cause gradual worsening of balance, coordination, and speech.
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A to Z: Ataxia, Cerebellar
See: Cerebellar Ataxia.
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A to Z: Atopic Dermatitis
See: Eczema.
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A to Z: Atresia
Learn about congenital defects and conditions that affect vessels, valves, and passages in the heart and other organs.
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A to Z: Atresia, Anal
Learn about congenital defects and conditions that affect vessels, valves, and passages in the heart and other organs.
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A to Z: Atresia, Aortic
Learn about congenital defects and conditions that affect vessels, valves, and passages in the heart and other organs.
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A to Z: Atresia, Biliary
Learn about congenital defects and conditions that affect vessels, valves, and passages in the heart and other organs.
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A to Z: Atresia, Choanal
Learn about congenital defects and conditions that affect vessels, valves, and passages in the heart and other organs.
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A to Z: Atresia, Pulmonary
Learn about congenital defects and conditions that affect vessels, valves, and passages in the heart and other organs.
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A to Z: Atresia, Tricuspid
Learn about congenital defects and conditions that affect vessels, valves, and passages in the heart and other organs.
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A to Z: Atrial Flutter
Atrial flutter is an abnormal heart rhythm that causes the heart to beat too fast.
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A to Z: Atrial Septal Defect (ASD)
Learn about congenital heart defects and conditions that affect the heart and circulatory system.
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A to Z: Atrioventricular Septal Defect
Learn about congenital heart defects and conditions that affect newborn babies.
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A to Z: Attention Deficit Hyperactivity Disorder (ADHD)
Learn about behavioral disorders and conditions that affect children's moods, activities, and interactions.
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A to Z: Autism
Learn about developmental disorders and conditions that affect children's moods, activities, and interactions.
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A to Z: Atresia, Esophageal
Learn about congenital defects and conditions that affect vessels, valves, and passages in the heart and other organs.
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A to Z: Amenorrhea, Secondary
Secondary amenorrhea is when a girl who had been getting her period stops menstruating for more than 6 months or for more than three of her usual cycles.
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A to Z: Anal Fissure
An anal fissure is a cut or tear in the lining of the anus.
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A to Z: Anaphylaxis
Anaphylaxis is a sudden, life-threatening reaction that is usually caused by an allergy.
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A to Z: Anemia
Learn about anemia, a common blood disorder that happens when the level of healthy red blood cells in the body becomes too low.
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A to Z: Anorexia Nervosa
Learn about anorexia nervosa, a type of eating disorder.
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A to Z: Appendicitis
Appendicitis is an inflammation of the appendix, and requires surgery.
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A to Z: Apthous Ulcers (Canker Sores)
Apthous ulcers, or canker sores, are non-contagious small ulcers that can occur inside the mouth, often causing discomfort during eating or talking.
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A to Z: Arrhythmia
An arrhythmia is an abnormal heart rhythm usually caused by an electrical "short circuit" in the heart.
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A to Z: Arteriovenous Malformation (AVM)
In this condition, an abnormal connection between arteries and veins causes blood to flow too quickly, leading to a risk of bleeding. Learn more here.
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A to Z: Arteritis
Learn about conditions that affect the heart and blood vessels.
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A to Z: Arthropathy
Learn about conditions that affect the joints, complications of diabetes, and complications of nervous system damage.
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A to Z: Asthma, Cough Variant
People with this type of asthma have a cough but no wheezing. Learn more about it here.
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A to Z: Astrocytoma
This type of brain tumor involves star-shaped cells of the brain that grow out of control. Learn about it here.
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A to Z: Amenorrhea, Primary
Primary amenorrhea is when a girl does not start her period by age 15 or 3 years after she begins puberty.
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A to Z: Amenorrhea
Amenorrhea is when a girl is not getting her period.
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A to Z: Amebiasis
Amebiasis is an intestinal illness. People get it after eating, drinking, or touching something that's contaminated with a tiny parasite called Entamoeba histolytica.
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A to Z: Alpha Thalassemia
Learn about genetic disorders and diseases and conditions that affect the blood.
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A to Z: Abuse, Sexual
Sexual abuse is sexual contact with a child or any behavior that is meant to sexually arouse the abuser.
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A to Z Symptom: Belly Pain
Belly pain is common and, most of the time, doesn't have a serious cause.
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A to Z: Abrasion
An abrasion is a minor scrape of the skin that can be treated easily with proper cleaning and care.
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A to Z: Abscess
An abscess is a collection of pus that forms as part of the body's response to an infection.
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A to Z: Abscess, Skin
A skin abscess forms when bacteria get under the skin.
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A to Z: Abscess, Tooth
A tooth abscess is a collection of infected material (pus) that forms at the tip of the root of a tooth.
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A to Z: Abuse, Physical
Physical abuse can be any kind of hitting, shaking, burning, pinching, biting, choking, throwing, beating, and other actions that cause physical injury, leave marks, or cause pain.
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A to Z: Abuse, Psychological
Psychological abuse happens when yelling and anger go too far or when people caring for kids constantly criticize, threaten, or dismiss them until their feelings of self-worth are damaged.
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A to Z: Abuse, Substance
Substance abuse is when someone drinks alcohol or smokes or takes drugs in a way that could lead to health, legal, and other problems.
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A to Z: Acanthosis Nigricans
Acanthosis nigricans is a condition in which the skin thickens and darkens in places.
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A to Z: Acute Febrile Mucocutaneous Lymph Node Syndrome (MCLS)
See: Kawasaki Disease.
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A to Z: Alopecia Areata
Alopecia areata is a condition that causes hair loss on the scalp and sometimes elsewhere on the body.
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A to Z: Allergy, Drug
Normally medicines help us treat disease, but in people with drug allergies, taking certain medicines can cause the immune system to react and harm the body.
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A to Z: Allergy
With allergies, the immune system overreacts and tries to "fight" allergens, which are ordinary things that cause an allergic reaction.
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A to Z: Alcohol Abuse
Learn about alcohol abuse and consequences of excessive drinking.
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A to Z: Adynamic Ileus
Learn about intestinal blockages and conditions that affect the digestive tract.
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A to Z: Adrenal Insufficiency
Adrenal insufficiency is a condition that happens when the adrenal glands do not work properly.
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A to Z: Adenovirus
Adenoviruses are a group of viruses that can infect the membranes (tissue linings) of the respiratory tract, eyes, intestines, and urinary tract. They are common among infants and young children.
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A to Z: Acne, Infant
Infant acne is common in babies, and usually goes away on its own without treatment or scarring.
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A to Z: Acute Myeloid Leukemia (AML)
Learn about different types of leukemia and cancers that affect the blood and bone marrow.
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A to Z: Acute Lymphoblastic Leukemia (ALL)
Learn about different types of leukemia and cancers that affect the blood and bone marrow.
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A to Z: Arthrogryposis
Learn about congenital conditions and conditions that affect the muscles and joints in newborn babies.
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A to Z: Anterior Cruciate Ligament (ACL) Injuries
Learn more about ACL injuries and how they're treated.
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A to Z: Achondroplasia
Achondroplasia is a genetic disorder that interferes with bone growth and causes dwarfism (short stature).
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A to Z: Abnormality of Gait (Gait Abnormality)
Abnormality of gait (or gait abnormality) is an unusual walking pattern or style.
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A to Z: Asthma
Asthma is a lung condition that causes difficulty breathing.
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A to Z: Asthma, Attack
Learn more about asthma attacks, when asthma symptoms suddenly become severe.