Mayo Clinic specialists answer health questions from readers like you.

• Dark circles under your eyes: What causes them?
• Daytime sleepiness in older adults: Do naps help or hurt?
• Deep-fried turkey: How to prepare it safely
• Degenerative changes in the spine: Is it arthritis?
• Delayed ejaculation: How is it treated?
• Delayed menstruation in teen: When should first period occur?
• Delayed muscle soreness: What causes it?
• Demyelinating disease
• Dental fillings: Do they have to be replaced?
• Dental floss vs. water pick: Which is better?
• Depersonalization: A feeling of being 'outside' your body
• Depression and anxiety: Can I have both?
• Depression in children: How is it treated?
• Detox diets: Do they offer any health benefits?
• Detox foot pads: Do they really work?
• Developmental hip dysplasia in infants
• Diabetes and Alzheimer's: Any connection?
• Diabetes diet: Can going vegetarian help?
• Diabetes diet: Should I avoid sweet fruits?
• Diabetes: How does it affect my liver?
• Diabetes: Is it true that I should avoid electric blankets?
• Diabulimia: How are diabetes and eating disorders related?
• Diamaxol: An herbal cure for diabetes?
• Diet soda: Is it bad for you?
• Dietary supplement labels: What are 'international units'?
• Dietary supplements: Are they necessary?
• Dietitian vs. nutritionist: What's the difference?
• Dieulafoy's lesion: How is it treated?
• Digestion: How long does it take?
• Dilation and curettage (D and C)
• Discolored baby teeth: A cause for concern?
• Discolored semen: What does it mean?
• Disk replacement: An effective treatment for low back pain?
• Diskogram, or discogram
• Dislocated elbow in children: A common injury?
• Diuretics: A cause of low potassium?
• Diverticulitis diet: Should I avoid nuts and seeds?
• Diverticulitis diet: What should I eat after an attack?
• Dog flu: Can humans catch it?
• Doppler ultrasound
• Down syndrome: Earlier prenatal testing is recommended
• Dried fruits: As good for you as fresh fruit?
• Drug interactions: What you should know about antacids
• Drug-induced comas: When and how are they used?
• Drug-resistant tuberculosis (XDR-TB): Am I at risk?
• Dry mouth in older adults
• Dry orgasm: What causes orgasm without ejaculation?
• Dysarthria (slurred speech): What are the causes?
• Dysplasia: Is it cancer?
• Dystonia treatment: Can it impair bone growth?