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Athlete's foot
Learn about the causes, symptoms, prevention and treatment of this common fungal skin infection.
Atelectasis
Atelectasis means a collapse of the whole lung or an area of the lung. It's one of the most common breathing complications after surgery.
Ataxia
Often caused by an underlying condition, this loss of muscle control and coordination can impact movement, speech and swallowing.
Astrocytoma
Learn about this type of cancer that can occur in the brain or spinal cord.
Astigmatism
Imperfect curvature of your eye can cause blurred distance and near vision. Learn about this common and treatable eye condition.
Asthma attack
Learn how to recognize when you need to use quick-relief treatment or get emergency care.
Asthma
Find out what can trigger asthma and how to relieve your symptoms and breathe easier.
Aspergillosis
This fungal lung infection is caused by inhaling certain mold spores. It may be serious in those with asthma or other chronic lung diseases.
Ascariasis
Learn more about the causes, treatment and prevention of this roundworm infection.
Asbestosis
Exposure to asbestos fibers causes this chronic lung disease. It may be decades before signs and symptoms such as shortness of breath and coughing appear.
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