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Atrial tachycardia

This type of fast heartbeat may occur after heart surgery or during pregnancy. But infections…

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Atrioventricular canal defect

This congenital heart defect involves a hole in the heart. It affects blood flow through…

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Atrioventricular nodal reentry tachycardia (AVNRT)

This most common type of supraventricular tachycardia, a type of irregular heartbeat, tends to occur…

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Attention-deficit/hyperactivity disorder (ADHD) in children

This condition affects children and may continue into adulthood. It can include having a hard…

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Atypical antidepressants

Bupropion, mirtazapine, nefazodone, trazodone, vilazodone, vortioxetine and esketamine are unique atypical antidepressants, each working in…

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Atypical cells: Are they cancer?

Atypical cells appear abnormal, but they aren't necessarily cancerous.

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Atypical genitalia

In this rare condition, a baby's genitals are not clearly male or female. Genitals may…

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Atypical hyperplasia of the breast

Learn how a diagnosis of atypical lobular hyperplasia or atypical ductal hyperplasia affects your risk…

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Atypical teratoid rhabdoid tumor (ATRT)

This rare, fast-growing brain or spinal tumor is most common in young children.

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Auditory processing disorder (APD)

This type of hearing loss involves the brain. Learn about ways that can help people…

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Autism spectrum disorder

This condition related to brain development causes problems in getting along with others socially and…

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Autism spectrum disorder and digestive symptoms

Children with autism spectrum disorder often have other health issues, including problems related to digestion.

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Autoimmune encephalitis

Learn how the immune system mistakenly attacks brain cells to cause swelling in the brain…

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Autoimmune epilepsy

Learn when epilepsy is an autoimmune disease and why early diagnosis and the right treatment…

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Autoimmune hepatitis

This type of hepatitis happens when the immune system attacks the liver with destructive antibodies.…

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Autoimmune pancreatitis

Autoimmune pancreatitis is a relatively uncommon disease of the pancreas that may be mistaken for…

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Autologous stem cell transplant

Understand this type of bone marrow transplant that uses your own blood stem cells to…

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Automated external defibrillators: Do you need an AED?

These potentially lifesaving machines are available without a prescription. Should you get one?

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Autonomic neuropathy

Damage to the nerves that control involuntary body functions, such as blood pressure and digestion,…

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AV node ablation

Learn who may benefit from this cardiac catheter procedure to correct persistent atrial fibrillation, or…

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Avascular necrosis (osteonecrosis)

A broken bone or dislocated joint can block blood flow to the bone, causing bone…

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Avulsion fracture: How is it treated?

Reattaching a small piece of bone that gets pulled away from the main part of…

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Awake brain surgery

Awake brain surgery is performed while you are awake and alert. This type of brain…

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B-cell lymphoma

Find out more about the symptoms, diagnosis and treatment of this type of non-Hodgkin lymphoma.

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Baby acne

Baby acne — Comprehensive overview covers causes, symptoms, treatment of this newborn complexion problem.

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Baby bath basics: A parent's guide

Learn how to give your baby a bath, from testing water temperature to holding your…

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Understanding baby weight: healthy or overweight?

Find out when your baby's weight might be of concern and how to promote a…

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Baby naps: Daytime sleep tips

Know when and how long babies need to sleep during the day, how to get…

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Baby poop: What to expect

Infant stool can have various colors and textures. Know what to expect in your newborn's…

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Baby teeth: When do children start losing them?

Losing baby teeth is a big childhood event. Find out what to expect.

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