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Diseases & Conditions

Milk allergy

Find out what happens when the immune system reacts to proteins in milk, causing allergic…

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Milk thistle

Learn about the potential benefits of milk thistle and how it is used to treat…

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Mindfulness exercises

Engaging with the world around you can lower your stress. Here's how to practice mindfulness…

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Minimally invasive heart surgery

Learn more about this surgery that uses small incisions in the chest as an option…

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Minimally invasive surgery

Learn more about laparoscopy or robotic surgical techniques, which may mean less pain and a…

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Minipill (progestin-only birth control pill)

This oral contraceptive, sometimes called the minipill, contains only the hormone progestin and no estrogen.

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Ministroke vs. regular stroke: What's the difference?

The term "ministroke" typically refers to a transient ischemic attack.

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Miscarriage

Learn what might cause the loss of a pregnancy, the symptoms and how to cope.

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Mitral valve disease

Learn more about diseases that affect the valve between the left heart chambers, including mitral…

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Mitral valve prolapse

This heart condition, also called Barlow syndrome, affects the valve separating the left heart chambers.…

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Mitral valve regurgitation

Learn more about the symptoms and treatment of this most common heart valve condition, which…

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Mitral valve repair and mitral valve replacement

If you have a leaky or stiff mitral valve, you may need heart surgery. Learn…

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Mitral valve stenosis

When the valve between the left heart chambers is narrowed, the heart doesn't get enough…

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Mittelschmerz

Some women experience pain on one side of the lower abdomen midway through their menstrual…

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Mixed connective tissue disease

This condition has symptoms of several other conditions, making it hard to diagnose. There's no…

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Mohs surgery

Find out what to expect during this skin cancer surgery that involves removing thin layers…

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Molar pregnancy

This rare pregnancy complication requires early treatment. Learn more about diagnosis and treatment of this…

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Mold allergy

Coughing, sneezing and itchy eyes often happen with this common allergy. Find out how to…

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Moldy cheese: Is it OK to eat?

Cheese with mold on it may not look tasty. But is it safe to eat?

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Molecular breast imaging

Learn about this breast cancer screening test that's sometimes used in addition to mammograms, especially…

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Moles

Moles, also known as nevi, are a common type of skin growth that vary in…

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Molluscum contagiosum

Learn how to prevent and treat this common skin infection that affects people of all…

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Monoamine oxidase inhibitors (MAOIs)

These antidepressants may help if other treatments fail. If you take them, stay away from…

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Monoclonal antibody medicines for cancer: How they work

Find out how monoclonal antibodies are being used in cancer treatment.

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Monoclonal gammopathy of undetermined significance (MGUS)

A condition of blood plasma that produces altered antibodies that increase the risk of blood…

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Mononucleosis

Learn about the symptoms and treatment of the kissing disease in adults and children.

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Mononucleosis and Epstein-Barr: What's the connection?

The Epstein-Barr virus sometimes causes a disease known as mono. Learn who is at risk…

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Mononucleosis: Can it recur?

Mono can return in some rare cases. Learn why that happens.

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Monosodium glutamate, also called MSG: Is it harmful?

This flavor enhancer often added to foods can cause headache and other symptoms in some…

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Mood disorders

These conditions affect emotions. Depression causes a feeling of deep sadness. Bipolar disorder goes back…

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