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Diseases & Conditions

Lung cancer

Learn about the symptoms, diagnosis and treatment for this deadly form of cancer.

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Lung cancer screening

Doctors recommend lung CT scans to look for signs of lung cancer in current and…

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Lung nodules: Can they be cancerous?

Lung nodules are common. Most aren't cancer. Find out what tests might be recommended if…

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Lung transplant

Learn what's involved in this major surgery that replaces a diseased or failing lung with…

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Lung volume reduction surgery

Lung volume reduction surgery helps some people with severe emphysema breathe easier. Diseased lung tissue…

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Lupus

Learn how this condition can affect the joints, skin, kidneys and other areas of the…

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Lupus nephritis

Learn about this common effect of lupus on the kidneys, including symptoms to watch for,…

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Lyme disease

Learn about the symptoms, diagnosis and treatment of this common tick-borne illness.

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Lymphedema

Damaged or removed lymph nodes can affect how lymph fluid drains. Fluid buildup leads to…

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Lymphocytosis (high lymphocyte count)

A brief increase in certain white blood cells, called lymphocytes, is typical after an infection.…

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Lymphoma

Find out more about the symptoms, diagnosis and treatment of this cancer of the lymphatic…

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Lynch syndrome

Learn about this condition that passes from parents to children, raising the risk of colon…

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Macrocytosis: What causes it?

Many factors can cause enlarged red blood cells.

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Magic mouthwash: Effective for chemotherapy mouth sores?

Find out what ingredients pharmacists use for this treatment for mouth sores caused by chemotherapy…

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Magnetic resonance elastography

This newer, noninvasive imaging test is used to find out how serious certain liver diseases…

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Magnetoencephalography

Learn how magnetoencephalography helps your care team locate key structures in your brain and plan…

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Malaria

Learn about the symptoms, causes, treatment, and prevention of this infectious disease transmitted to humans…

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Male breast cancer

Breast cancer can affect anyone. Learn about the signs and symptoms of this cancer. Treatment…

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Male depression: Understanding the issues

Men may cope with depression in unhealthy ways. Depression in men often is not diagnosed…

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Male hypogonadism

This condition affects being able to make enough of the hormone testosterone or enough sperm…

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Male infertility

Male infertility often plays a role when couples have trouble conceiving. Find out what causes…

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Male masturbation: Does frequency affect male fertility?

Male masturbation has little effect on sperm count or quality.

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Male menopause: Myth or reality?

Male menopause is a catchy phrase, but it isn't accurate. Here's why.

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Malignant hyperthermia

This rare genetic disorder triggers a severe reaction to certain anesthesia drugs, causing rigid muscles,…

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Malignant peripheral nerve sheath tumors (MPNST)

These cancers form in the linings of nerves. Treatment includes surgery, radiation therapy and, sometimes,…

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Mammary duct ectasia

Mammary duct ectasia is a noncancerous breast condition that affects the milk ducts. Learn the…

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Mammogram

Learn what to expect during a breast X-ray exam. Find out about the benefits of…

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Mammogram guidelines: What are they?

Latest Mayo Clinic mammogram guidelines for breast cancer screening.

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Mantle cell lymphoma

Find out more about the symptoms, diagnosis and treatment of this type of non-Hodgkin lymphoma.

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MAOIs and diet: Is it necessary to restrict tyramine?

A low-tyramine diet is important for anyone taking MAOIs.

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