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Diseases & Conditions

Liver function tests

Liver function tests can help determine how well your liver is doing its job. Find…

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Liver hemangioma

This noncancerous liver mass usually doesn't need treatment. Find out more about this common liver…

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Liver transplant

Learn what to expect before and after this important treatment option for people with liver…

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Living-donor kidney transplant

Find out more about living-donor kidney transplant, an option instead of deceased-donor kidney transplant.

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Living-donor liver transplant

Learn about this surgery that uses a portion of a liver from a healthy living…

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Living-donor transplant

This surgery uses a living donor's organ, such as a kidney or portion of a…

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Living wills and advance directives for medical decisions

Living wills and other advance directives describe your treatment preferences in end-of-life situations when you…

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Lobular carcinoma in situ (LCIS)

If a breast biopsy reveals you have LCIS, your risk of breast cancer is increased.…

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Locomotor training for spinal cord injury

Learn what's involved with this therapy designed to improve movement and mobility after a spinal…

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Long COVID: Lasting effects of COVID-19

COVID-19 can have lasting symptoms that affect many parts of the body. Learn more about…

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Long QT syndrome

Learn more about the causes and treatment of this heart rhythm disorder that can cause…

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Loss of sex drive in men: Natural with aging?

Age-related loss of sex drive is normal, but sometimes an underlying condition is at play.

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Loss of smell (anosmia)

A stuffy nose is one cause of this symptom. Learn about other causes and when…

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Loss of taste and smell: Natural with aging?

Aging can play a role in the loss of taste and smell — but not…

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Low amniotic fluid: Can it be treated?

Delivery, amnioinfusion and drinking more fluids might be recommended when amniotic fluid is found to…

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Low blood cell counts: Side effects of cancer treatment

Find out why your doctor tests your blood during cancer treatment and what signs and…

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Low blood oxygen (hypoxemia)

Learn causes of low blood oxygen and find out when to call your doctor.

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Low blood pressure (hypotension)

This condition isn't always a concern. But sometimes it can cause dizziness and fainting or…

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Low blood sodium in older adults: A concern?

For older adults, low blood sodium, known as hyponatremia, can cause death if left untreated.

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Low-carb diet: Can it help you lose weight?

Find out about low-carb diets, from what foods to limit to potential health benefits.

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Low-fiber diet do's and don'ts

Learn which foods are allowed and which foods to avoid on a low-fiber diet.

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Low-glycemic index diet: What's behind the claims?

Find out about the low-glycemic index diet — an eating plan based on how food…

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Low hemoglobin count

A low hemoglobin count on a blood test could be normal for you, or it…

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Low-phosphorus diet: Helpful for kidney disease?

If you have kidney disease, you may need to limit the amount of this mineral…

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Low potassium (hypokalemia)

Certain prescription medicines, vomiting and diarrhea are just some of the causes of low potassium.

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Low sex drive in women

Many women have dips in sexual desire at some point. But you can get your…

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Low sperm count

This health concern can make it challenging to start a pregnancy. Learn about possible causes…

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Low white blood cell count

Learn the causes of this decrease in disease-fighting cells in the blood.

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Lumbar puncture (spinal tap)

Learn about lumbar puncture, which removes a sample of cerebrospinal fluid to find infections, bleeding…

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Lumpectomy

Learn what to expect from this breast-conserving surgical procedure.

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