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Bedbugs
Learn more about the symptoms, treatment, prevention of these parasitic insects and their bites.
Bartholin's cyst
A Bartholin's cyst is a fluid-filled lump near the vaginal opening. It's rarely serious, but when infected, it can be painful.
Atrial tachycardia
This type of fast heartbeat may occur after heart surgery or during pregnancy. But infections may trigger it, too. Learn how it's diagnosed and treated.
Atrial fibrillation
A fast, pounding heartbeat could be due to AFib, a type of heart rhythm problem. Know the warning signs and when treatment is needed.
Atopic dermatitis (eczema)
Learn about the causes, symptoms and treatments of this itchy rash that most often begins before age 5, is persistent, and has periods of clearing and relapse.
Asthma attack
Learn how to recognize when you need to use quick-relief treatment or get emergency care.
Arteriovenous fistula
Irregular connections between arteries and veins may cause certain complications. Learn more about the causes and possible treatment options.
Appendicitis
Is it just a bellyache or something more serious? Find out about the symptoms and treatment for inflammation of the appendix.
Aplastic anemia
Your body stops producing enough new blood cells in this rare and serious condition, possibly causing fatigue, higher risk of infections and uncontrolled bleeding.
Aphasia
Some conditions, including stroke or head injury, can seriously affect a person's ability to communicate. Learn about this communication disorder and its care.
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