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Diseases & Conditions

Needle biopsy

Common needle biopsy procedures include fine-needle aspiration biopsy and core needle biopsy. Find out about…

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Neobladder reconstruction

Learn about bladder reconstruction to restore urinary function after bladder removal surgery, including how it's…

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Nephrectomy (kidney removal)

Learn about surgery to remove all or part of a kidney.

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Nephrogenic systemic fibrosis

Learn about symptoms, risk factors and possible treatments for this rare disorder in people with…

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Nephrotic syndrome

Swelling around your feet and ankles is a common sign of this condition that occurs…

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Nervous breakdown: What does it mean?

Nervous breakdown isn't a medical term. It most often means a mental health crisis that…

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Neti pot: Can it clear my nose?

Learn more about this container designed to rinse debris or mucus from the nasal cavity.

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Neuroblastoma

Learn more about the symptoms, diagnosis and treatment of neuroblastoma, one of the most common…

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Neurodermatitis

Learn about this itchy skin condition that can disrupt your sleep and daily activities. Treatment…

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Neuroendocrine tumors

Learn about the types of tumors that make up this group of rare cancers. Find…

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Neurofibroma

Learn about this type of peripheral nerve tumor that forms a soft bump on or…

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Neurofibromatosis type 1

This genetic condition causes tumors on nerve tissue. Surgery and other therapies can manage symptoms.

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Neurological examinations

These questions and procedures can help healthcare professionals identify nervous system conditions.

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Neuromyelitis optica

Understand more about this condition that affects the spinal cord and eye nerves and is…

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Neurontin side effects: How do I manage them?

Some Neurontin side effects can be troubling and require an exam by your healthcare professional.

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Neutropenia (low neutrophil count)

Learn what can cause a lack of certain white blood cells.

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New FDA-approved blood tests for diagnosing Alzheimer's disease

A simple blood test done in a doctor's office can help to diagnose Alzheimer's disease.…

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Newborn sleep: Should I wake my baby for feedings?

Get the facts about when to wake a sleeping baby for a feeding.

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Niacin

Learn how the body uses this supplement and how it might help manage cholesterol.

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Niacin overdose: What are the symptoms?

When niacin is taken as prescribed for high cholesterol, overdose is unlikely.

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Niacin to improve cholesterol numbers

This B vitamin can boost levels of high-density lipoprotein — also called HDL — cholesterol,…

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Nickel allergy

Nickel allergy is an immune system reaction to nickel. This metal is often in jewelry,…

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Nicotine dependence

Learn about the chemical in tobacco that makes it hard to stop smoking. Then find…

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Niemann-Pick disease

A condition passed down in families that affects how the body breaks down and uses…

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Night leg cramps

Find out about this common nighttime pain in the calf, foot or thigh and how…

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Night sweats

Learn what conditions and medications might cause these sleep-disturbing sweats.

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Nightmare disorder

Nightmare disorder involves disturbing or scary dreams that awaken you, causing distress or preventing adequate…

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Nighttime headaches: How can I get relief?

"Alarm clock" (hypnic) headaches wake people up. But other nighttime headaches also can disrupt sleep.…

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Nighttime panic attacks: What causes them?

Nighttime panic attacks can cause sweating, rapid heart rate, trembling, shortness of breath, heavy breathing,…

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Nipple discharge

Fluid leaking from the nipples isn't often a sign of breast cancer. Learn more about…

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