Pregnancy symptoms
Learning Center
Aortic calcification: An early sign of heart valve problems?
Aortic valve calcification — once thought a harmless condition — may be a sign of heart valve disease.
Apple cider vinegar for weight loss
Proponents tout apple cider vinegar as a weight-loss aid, but there's little proof that it works.
Arcus senilis: A sign of high cholesterol?
With this condition, older adults develop a gray arc around the cornea of the eyes.
Artificial sweeteners: Any effect on blood sugar?
Artificial sweeteners, also called sugar substitutes, offer the sweetness of sugar without the calories.
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 for dry eyes.
Aspirin allergy: What are the symptoms?
An aspirin allergy or sensitivity can cause serious symptoms.
Aspirin during pregnancy: Is it safe?
A Mayo Clinic specialist explains what you need to know about taking aspirin if you're pregnant.
Asthma and acid reflux: Are they linked?
A Mayo Clinic expert discusses how acid reflux can make asthma worse.
Asthma diet: Does what you eat make a difference?
Can what you eat affect your asthma? Learn how healthy eating habits may reduce asthma symptoms.
Atypical cells: Are they cancer?
Atypical cells appear abnormal, but they aren't necessarily cancerous.
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