Mayo Clinic specialists answer health questions from readers like you.

• Abdominal aortic aneurysm: Is exercise safe?
• Abnormal sperm morphology: What does it mean?
• Abortion: Does it affect subsequent pregnancies?
• Acai berries: Do they have health benefits?
• ACE inhibitors: Safe for people with kidney disease?
• Acetyl-L-carnitine: Can it relieve MS fatigue?
• Acid reflux and GERD: The same thing?
• Acne scars: What's the best treatment?
• Acrylic nails: Can they harm natural nails?
• Acupuncture for back pain?
• Acute bronchitis: Is it contagious?
• Acute respiratory distress syndrome (ARDS)
• Acute sinusitis: Do over-the-counter treatments help?
• ADHD diet: Do food additives cause hyperactivity?
• ADHD: Does caffeine help?
• Adrenal fatigue: What causes it?
• Adult acne: Can natural hormone treatments help?
• Adult bed-wetting: A concern?
• Adult chickenpox: A cause of male infertility?
• Adult circumcision: Does it increase sexual pleasure?
• Aerobic exercise: What's the best frequency for workouts?
• African-Americans and skin cancer: Do I need sunscreen?
• After a flood, are food and medicine safe to use?
• Air pollution and exercise: Is outdoor exercise risky?
• Air travel during pregnancy: Is it safe?
• Air travel with infant: Is it safe?
• Airborne cold remedy: Does it prevent colds?
• Albuterol side effects: What's normal?
• Alcohol poisoning: A serious consequence of binge drinking
• Alcohol: Does it affect blood pressure?
• Alcoholism treatment: What role does nutrition play?
• Alkaline water: Better than plain water?
• Allergy medications and pregnancy: What's safe?
• Alport syndrome
• Altitude sickness: Can it cause memory loss?
• Alzheimer's caregivers: Dealing with repeated questions
• Alzheimer's disease: Can exercise prevent memory loss?
• Alzheimer's disease: Does high IQ slow progression?
• Alzheimer's nose spray: New Alzheimer's treatment?
• Alzheimer's prevention: Does it exist?
• Alzheimer's test: Detection at the earliest stages
• Alzheimer's: Can a head injury increase my risk?
• Alzheimer's: Can a Mediterranean diet lower my risk?
• Ambien: Is dependence a concern?
• Amiodarone side effects: A cause of Parkinson-like tremors?
• Anesthesia: Safe for people with asthma?
• Angelman's syndrome
• Angiosarcoma
• Ankle swelling during pregnancy: What helps?
• Ankle weights for fitness walkers: Good idea?
• Antibiotics and alcohol: Should I avoid mixing them?
• Antibiotics and pregnancy: What's safe?
• Antidepressant withdrawal: Is there such a thing?
• Antidepressants and alcohol: What is the concern?
• Antidepressants and weight gain: What causes it?
• Antidepressants: Can they stop working?
• Antidepressants: Which cause the fewest sexual side effects?
• Antioxidant supplements: Can they prevent heart disease?
• Anxiety: A cause of high blood pressure?
• Aortic calcification: An early sign of heart valve problems?
• Aortic regurgitation: How does it affect pulse pressure?
• Apple cider vinegar for weight loss: Effective?
• Arcus senilis: A sign of high cholesterol?
• Are probiotics and prebiotics important for health?
• Aromatherapy: Is it worthwhile?
• Arteriovenous malformation (AVM) in the brain
• Arthritis medications: Can I take them only when I need them?
• Arthritis pain medications: Do they raise blood pressure?
• Arthritis: How is it diagnosed?
• Artificial sweeteners: Any effect on blood sugar?
• Artificial tears: How to select eyedrops for dry eyes
• Aspergillosis
• Aspirin allergy: What are the symptoms?
• Aspirin during pregnancy: Is it safe?
• Asthma and acid reflux: Are they linked?
• Asthma diet: Does what you eat make a difference?
• Asthma in pregnancy: How does it affect me and my baby?
• Asthma triggers: Are hard flooring surfaces better than carpet?
• Asthma without wheezing: Is this possible?
• Asthma: Why are symptoms worse during my period?
• Atypical cells: Are they cancer?
• Autism treatment: Can chelation therapy help?
• Autism treatment: Can special diets help?
• Autistic spectrum disorders
• Avandia safety concerns: What should I do?
• Avulsion fracture: How is it treated?
• Axona: Medical food to treat Alzheimer's
• Azoospermia: Can it be treated?