Mayo Clinic specialists answer health questions from readers like you.

• Abdominal aortic aneurysm: Is exercise safe?
• Abortion: Does it cause infertility?
• Abortion: Does it increase the risk of breast cancer?
• Acai berry products: What are the health benefits?
• ACE inhibitors: Safe for people with kidney disease?
• Acetyl-L-carnitine: Can it relieve MS fatigue?
• Achilles tendinitis: Is ultrasound therapy an effective treatment?
• Acid reflux and GERD: Are they the same thing?
• Acne scars: What's the best treatment?
• Acrylic nails: Can they harm your natural nails?
• Acute bronchitis: Is it contagious?
• Acute respiratory distress syndrome (ARDS)
• ADHD diet: Do food additives cause hyperactivity?
• ADHD: Does caffeine help?
• Adrenal fatigue: What causes it?
• Adult acne: Is it caused by a hormonal imbalance?
• Adult bed-wetting: A concern?
• Adult chickenpox: A cause of male infertility?
• Adult circumcision: Does it increase sexual pleasure?
• African-Americans and skin cancer: Do I need sunscreen?
• Air fresheners: Could continuous scents hurt my lungs?
• Air travel during pregnancy: Is it safe?
• Air travel with infant: Is it safe?
• Airborne cold remedy: Does it prevent colds?
• Albuterol side effects in children: Is irritability normal?
• Alcohol allergy: Is there such a thing?
• Alcohol and smoking: Risk factors for diabetes?
• 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 regular water?
• Allergic to cold weather?
• Allergy medications during pregnancy: Are they safe?
• Alport syndrome
• Alternative cancer treatment: Can vitamin C kill cancer cells?
• Altitude sickness: Can it cause memory loss?
• Alzheimer's caregivers: Dealing with repeated questions
• Alzheimer's disease: Does high IQ slow progression?
• Alzheimer's: Can a head injury increase my risk?
• Alzheimer's: Can antipsychotic drugs reduce agitation?
• Ambien: Is dependence a concern?
• American ginseng: Can it relieve cancer fatigue?
• Amiodarone side effects: A cause of Parkinson-like tremors?
• Anesthesia: Safe for people with asthma?
• Angelman's syndrome
• Angiosarcoma
• Ankle swelling during pregnancy: Is it a concern?
• Ankle weights for fitness walkers: Helpful or harmful?
• Anti-seizure medications: Can I stop taking them?
• Antibiotics and alcohol: Should I avoid mixing them?
• Antibiotics and pregnancy
• Antidepressant 'withdrawal': Is there such a thing?
• Antidepressant side effects: Is osteoporosis a concern?
• Antidepressants and alcohol: What happens if I drink alcohol?
• Antidepressants and weight gain
• Antidepressants: Can they stop working?
• Antidepressants: Which cause the fewest sexual side effects?
• Antinuclear antibody (ANA) test: Can it diagnose lupus?
• Antioxidant supplements: Can they prevent heart disease?
• Antipsychotic medications: Why do they cause weight gain?
• Anxiety: A cause of high blood pressure?
• Anxiety: When is it a problem?
• Aortic calcification: A sign of early heart disease?
• Aortic regurgitation: How does it affect pulse pressure?
• Aortic stenosis: Is it safe to delay surgery?
• Appendix stones (fecal stones): A cause of appendicitis?
• Apple cider vinegar for weight loss: Does it work?
• Arcus senilis: A sign of high cholesterol?
• Arteriovenous (AV) fistula
• Arteriovenous malformation (AVM) in the brain
• Arthritis medications: Can I take them only when I need them?
• Arthritis pain medications: Which are safe for my heart?
• Arthritis: How is it diagnosed?
• Artificial sweeteners: Any effect on blood sugar?
• Aspergillosis
• Aspirin allergy: What are the symptoms?
• Aspirin during pregnancy: Is it safe?
• Asthma in pregnancy: How does it affect me and my baby?
• Asthma without wheezing: Is this possible?
• Atelectasis (collapsed lung)
• Atypical cells: Are they cancer?
• Atypical depression: How is it different from 'regular' depression?
• Autism treatment: Can chelation therapy help?
• Autism treatment: Can special diets help?
• Autistic spectrum disorders
• Avulsion fracture: How is it treated?
• Azoospermia: Can it be treated?