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Baby acne
Baby acne — Comprehensive overview covers causes, symptoms, treatment of this newborn complexion problem.
BRCA gene test for breast and ovarian cancer risk
Find out what to expect if you're considering a blood test to determine if you have an increased risk of breast cancer. Learn what your results might mean.
Atypical hyperplasia of the breast
Learn how a diagnosis of atypical lobular hyperplasia or atypical ductal hyperplasia affects your risk of breast cancer and what you can do.
Atrioventricular canal defect
This congenital heart defect involves a hole in the heart. It affects blood flow through the heart valves. Learn the symptoms and how it's treated.
Atrial septal defect (ASD)
This heart problem that is present at birth causes a hole between the heart's upper chambers. It can be treated.
Astigmatism
Imperfect curvature of your eye can cause blurred distance and near vision. Learn about this common and treatable eye condition.
Asthma: Limit asthma attacks caused by colds or flu
If you have asthma, find out how to keep your sneeze from turning into a wheeze due to colds or flu.
Aspirin during pregnancy: Is it safe?
A Mayo Clinic specialist explains what you need to know about taking aspirin if you're pregnant.
Arteriovenous malformation
In this condition, a tangle of blood vessels affects the flow of blood and oxygen. Treatment can help.
Are you thinking about suicide? How to stay safe and find treatment
If you have suicidal thoughts, contact a suicide hotline or a mental health professional. Get help for depression. Make a plan to get through a crisis.
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