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Diseases & Conditions

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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運動障害

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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多発性硬化症

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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Multivitamins: Do young children need them?

Multivitamins: Are they good insurance for young children?

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Mumps

Find out more about the symptoms and treatment of this viral illness and how vaccines…

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Muscle cramp

Learn about this sudden, painful tightening of a muscle and what to do about it.

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Muscle pain

Muscle pain: Symptom — Overview covers definition, possible causes of this symptom.

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Muscle strains

Minor strains may only overstretch a muscle or tendon, while more severe injuries may involve…

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Muscular dystrophy

Find out about the various types of this condition, which affects muscles over time. Then…

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Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS)

This complicated condition may be triggered by an infection. While there's no cure for ME/CFS,…

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