Mayo Clinic specialists answer health questions from readers like you.

• Macrocytosis (enlarged red blood cells)
• Magnesium deficiency: A cause of tremors?
• Magnet therapy: Can it relieve pain?
• Maintenance chemotherapy: What is it?
• Male urinary incontinence: A normal part of aging?
• Male yeast infection: Can I get it from my girlfriend?
• Male yeast infections: Can I use Monistat?
• Mammogram: Can it find cancer in dense breasts?
• Mangosteen (Xango) juice: Can it help arthritis?
• Mannitol: Can it improve stroke recovery?
• MAOIs and diet: Restricting tyramine prevents serious side effect
• Marijuana and depression: What's the link?
• Mastectomy: Is it safe to have blood pressure taken on the side of surgery?
• Masturbation: Does frequency affect male fertility?
• Mayonnaise: A common cause of food poisoning?
• Mediterranean diet: Can it prevent Alzheimer's?
• Medullary sponge kidney
• Melatonin side effects: What are the risks?
• Meningioma
• Meningitis vaccine: Can infants get it?
• Meniscus tear
• Menopause and high blood pressure: What's the connection?
• Menstrual cup: What is it?
• Metabolism: What's the best way to boost it?
• Metallic taste in mouth: A cause for concern?
• Metopic synostosis
• Microcephaly
• Microwave cooking: Does it destroy nutrients in vegetables?
• Microwave popcorn: Is it linked to lung disease?
• Midcycle menstrual cramps: What causes this?
• Migraine headaches: Can they be triggered by weather changes?
• Migraine medications and antidepressants: A risky mix?
• Migraine treatment: Can antidepressants help?
• Migraines and gastrointestinal problems: Is there a link?
• Migraines and pregnancy: Any connection?
• Mini-stroke vs. stroke: What's the difference?
• Minimal change disease in children
• Mistletoe: A possible cancer treatment?
• Molar pregnancy: Will it happen again?
• Mold allergy: Should I get rid of my houseplants?
• Moldy cheese: Is it OK to eat?
• Mole removal cream: Does it work?
• Monoclonal gammopathy: Is it cancer?
• Mononucleosis and Epstein-Barr: Are they related?
• Monosodium glutamate (MSG): What is it and is it harmful?
• Morning sickness: When is it a concern?
• Morning-after pill: Emergency birth control
• Mosquito bites: What is a normal skin reaction?
• Motion sickness: Tips for preventing it in kids?
• Mounier-Kuhn's syndrome (tracheobronchomegaly)
• Moyamoya disease: How is it treated?
• Mr. Clean Magic Eraser: Can it cause chemical burns?
• MRI: Can gadolinium contrast agent cause kidney failure?
• MSM for arthritis pain: Any harm in long-term use?
• Mucus in stool: A concern?
• Multiple sclerosis treatment: Is combination therapy effective?
• Multiple sclerosis: Can it cause seizures?
• Multivitamins: Do young children need them?
• Munchausen syndrome
• My friend has an eating disorder: What should I do?
• Myofascial release therapy: Can it relieve back pain?