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Artificial tears: How to select eye drops for dry eyes

Not all eye drops are the same. Here's what to consider when choosing artificial tears…

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Asbestosis

Exposure to asbestos fibers causes this chronic lung disease. It may be decades before signs…

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Ascariasis

Learn more about the causes, treatment and prevention of this roundworm infection.

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Aspartate aminotransferase (AST) blood test

An AST blood test helps check for liver damage. Learn when the test is done,…

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Aspergillosis

This fungal lung infection is caused by inhaling certain mold spores. It may be serious…

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Aspirin allergy: What are the symptoms?

An aspirin allergy or sensitivity can cause serious symptoms.

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Aspirin during pregnancy: Is it safe?

A Mayo Clinic specialist explains what you need to know about taking aspirin if you're…

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Asthma

Find out what can trigger asthma and how to relieve your symptoms and breathe easier.

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Asthma and acid reflux: Are they linked?

A Mayo Clinic expert explains how acid reflux can make asthma worse.

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Asthma attack

Learn how to recognize when you need to use quick-relief treatment or get emergency care.

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Asthma diet: Does what you eat make a difference?

Can what you eat affect your asthma? Learn how healthy eating habits may reduce asthma…

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Asthma inhalers: Which one's right for you?

With so many options, choosing an asthma inhaler can be confusing. Use this helpful guide…

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Asthma: Limit asthma attacks caused by colds or flu

If you have asthma, find out how to keep your sneeze from turning into a…

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Asthma medications: Know your options

Learn more about the different categories of medications to help you control asthma symptoms.

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Asthma: Steps in testing and diagnosis

Think you or your child might have asthma? Here's what's involved in making a diagnosis.

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Asthma treatment: 3 steps to better asthma control

Follow this 3-step approach to keep symptoms under control and prevent attacks.

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Astigmatism

Imperfect curvature of your eye can cause blurred distance and near vision. Learn about this…

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Astrocytoma

Learn about this type of cancer that can occur in the brain or spinal cord.

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At-home colon cancer tests

Learn about at-home colon cancer tests. Find out why or why not to have one.

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Ataxia

Often caused by an underlying condition, this loss of muscle control and coordination can impact…

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Atelectasis

Atelectasis means a collapse of the whole lung or an area of the lung. It's…

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Athlete's foot

Find out about this common fungal skin infection that usually starts between the toes. It…

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Atkins Diet: What's behind the claims?

Considering cutting carbs to lose weight? Get the facts about the Atkins Diet.

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Atopic dermatitis (eczema)

Learn about the causes, symptoms and treatments of this itchy rash that most often begins…

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Atrial fibrillation

A fast, pounding heartbeat could be due to AFib, a type of heart rhythm disorder.…

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Atrial fibrillation ablation

Learn how heat or cold energy can treat an irregular heartbeat called atrial fibrillation (AFib).

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Atrial fibrillation and managing stress

Stress, anxiety and depression are bad for your heart, but whether they trigger AFib is…

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Atrial flutter

Learn more about this condition in which the heart's upper chambers beat too quickly, causing…

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Atrial flutter ablation

This treatment uses heat energy to treat a rapid, fluttering heartbeat. Know why and when…

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Atrial septal defect (ASD)

This heart problem that is present at birth causes a hole between the heart's upper…

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