Mayo Clinic specialists answer health questions from readers like you.

• Obstructive sleep apnea and anesthesia: What are the risks?
• Ocular migraine
• Ocular migraine: What causes it?
• Oil of oregano: Can it treat sinusitis?
• Older fathers and autism risk: Is there a connection?
• Olive oil: A healthy choice for your heart
• Oophorectomy (ovary removal): A risk factor for dementia?
• Optic neuritis: A symptom of multiple sclerosis?
• Oral cancer: Is new screening technique helpful?
• Organ donation: Can I be an organ donor if I've had cancer?
• Organic baby food: Is it better than regular baby food?
• Osteitis condensans ilii
• Osteitis pubis
• Osteoarthritis: Causes in younger adults?
• Osteoporosis exercise: Can I safely play golf?
• Osteoporosis treatment: How do you measure its effectiveness?
• Osteoporosis: Can kids get it too?
• Osteotomy: An alternative to knee replacement for osteoarthritis?
• Ovarian cancer vaccine: Is there such a thing?
• Ovarian cancer: Still possible after hysterectomy?
• Ovarian cysts and infertility: Is there a connection?
• Ovarian hyperstimulation syndrome: A possible complication of IVF?
• Ovary removal: Can I get pregnant with only one ovary?
• Over-the-counter teeth whitening products: Are they safe?
• Ovulation signs and symptoms: When am I most fertile?
• Ozone filters: Do they remove allergens from the air?