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Monoclonal antibody drugs 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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Morning-after pill

This type of emergency birth control can help prevent a pregnancy after sex if protection…

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Morning sickness

Learn more about nausea and vomiting during pregnancy. Learn about remedies that may help ease…

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Morphea

Learn more about this rare, painless skin condition, including risk factors, symptoms, complications and treatment.

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Morton neuroma

Learn how this painful foot condition is diagnosed and treated.

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Mosquito bites

Learn about the many ways to prevent mosquito bites and how to ease the itch…

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Motion sickness: First aid

Any type of transportation can bring on the nausea and dizziness of motion sickness. Here…

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Mountain pose

Try this simple yoga pose while standing.

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Mouth cancer

Learn what healthcare professionals look for when diagnosing mouth cancer. Find out about oral cancer…

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Mouth sores caused by cancer treatment: How to cope

Find out what you can do to prevent mouth sores before you begin cancer treatment.

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Movement disorders

Learn about the different types of neurological conditions that affect movement.

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Moyamoya disease

This rare condition happens when blood flow to the brain is blocked or narrowed and…

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Mpox (monkeypox): What is it and how can it be prevented?

Find out more about this rare viral infection, the possible symptoms in humans, treatment options…

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MRI

Learn more about how to prepare for this painless diagnostic test that creates detailed pictures…

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MRI: Is gadolinium safe for people with kidney problems?

Older gadolinium contrast agents used with MRI posed a risk for people with severe kidney…

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MRSA infection

MRSA infections often occur in health care settings, but they can happen anywhere. Find out…

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Mucus in stool: A concern?

Visible mucus in stool can have a variety of causes, but they're not always serious.

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Multiple endocrine neoplasia, type 1 (MEN 1)

Learn about this rare condition that causes tumors to grow and too many hormones to…

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Multiple endocrine neoplasia, type 2 (MEN 2)

Learn about this rare disorder that causes tumors and overproduction of hormones.

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Multiple myeloma

Learn about this cancer that forms from white blood cells called plasma cells. Treatments include…

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Multiple sclerosis

This nervous system condition causes a range of symptoms. While there's no cure, it's possible…

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Multiple sclerosis: Can it cause seizures?

Seizures occur more often in people with multiple sclerosis than in the general population.

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Multiple system atrophy

This rare condition affects movement, blood pressure and other functions of the body.

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Multisystem inflammatory syndrome in children (MIS-C) and COVID-19

Learn about symptoms of MIS-C, a serious condition linked to coronavirus disease 2019 (COVID-19). Get…

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