Mayo Clinic specialists answer health questions from readers like you.

• Macrocytosis: What causes it?
• Magic mouthwash: Effective for chemotherapy mouth sores?
• Magnet therapy: Can it relieve pain?
• Maintenance chemotherapy: What is it?
• Male masturbation: Does frequency affect male fertility?
• 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 guidelines: What are they?
• Mammogram: Can it find cancer in dense breasts?
• Mangosteen juice: Can it relieve arthritis pain?
• Manual treadmill vs. motorized treadmill: Which is better?
• MAOIs and diet: Is it necessary to restrict tyramine?
• Marijuana and depression: What's the link?
• Mastectomy: Is it safe to have blood pressure taken on the side of surgery?
• 'Mayo Clinic diet': Does it exist?
• 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
• Meniscus tear
• Menopause and high blood pressure: What's the connection?
• Menstrual cup: Good alternative to tampons?
• Metabolism: What's the best way to boost it?
• Metallic taste in mouth: A cause for concern?
• Metopic synostosis
• Microwave cooking: Does it destroy nutrients in vegetables?
• Microwaving plastic: Does it release dioxins?
• Midcycle menstrual cramps: What causes this?
• 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?
• Migraines: Are they triggered by weather changes?
• Mild depression: Are antidepressants effective?
• Milnacipran (Savella) for fibromyalgia: What makes it different?
• Minimal change disease in children
• Ministroke vs. regular stroke: What's the difference?
• Mistletoe: A possible cancer treatment?
• Mitral valve prolapse: Can it thicken the aorta?
• Moldy cheese: Is it OK to eat?
• Monoclonal gammopathy: Is it cancer?
• Mononucleosis and Epstein-Barr: What's the connection?
• Mononucleosis: Can it recur?
• Monosodium glutamate (MSG): Is it harmful?
• Mosquito bites: What is a normal skin reaction?
• Mounier-Kuhn's syndrome (tracheobronchomegaly)
• Moyamoya disease: How is it treated?
• MRI: Is gadolinium safe for people with kidney problems?
• MSM for arthritis pain: Is it safe?
• Mucus in stool: Is it a concern?
• MUFAs: Why should my diet include these fats?
• Multigrain vs. whole grain: Which is healthier?
• 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?