Diseases & conditions A-Z List
Diseases & Conditions A-Z List - «N»:
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Noninvasive
The term noninvasive can refer to diseases, procedures, or devices:
Noninvasive diseases usually do not spread to or damage other organs and tissues.
Noninvasive procedures do not involve tools that break the skin or physically enter the body. Examples include x-rays, a standard eye exam, CT sca...
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Noonan syndrome
Noonan syndrome is a genetic disorder that causes abnormal development of multiple parts of the body. It used to be called Turner-like syndrome because certain symptoms (webbing of neck and abnormally shaped chest) resembled those seen in Turner syndrome.
Causes
Defects in four genes (KRAS, PTPN11,...
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Normal growth and development
A child's growth and development can be divided into four periods:
Infancy
Preschool years
Middle childhood years
Adolescence
Immediately after birth, an infant normally loses about 5 - 10% of his or her birth weight. However, by about age 2 weeks, an infant should start to gain weight and grow qu...
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Normal pressure hydrocephalus (NPH)
Hydrocephalus refers to a build-up of fluid inside the skull, leading to brain swelling. Hydrocephalus means "water on the brain."
Normal pressure hydrocephalus (NPH) is a rise in cerebrospinal fluid (CSF) in the brain that affects brain function. However, the pressure of the fluid is usually normal...
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Norpramin overdose
Norpramin is a type of drug called a tricyclic antidepressant. It is used to treat depression.
Norpramin overdose occurs when you accidentally or intentionally take too much of this medicine.
This is for information only and not for use in the treatment or management of an actual poison exposure. If...
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Nose fracture
A nose fracture is a break in the bone or cartilage over the bridge, in the sidewall, or septum (line dividing the nostrils) of the nose.
Considerations
A fractured nose is the most common fracture of the face. It usually occurs after an injury and often occurs with other facial fractures.
Sometime...
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Nuclear stress test
Thallium stress test is a nuclear imaging method that shows how well blood flows into the heart muscle, both at rest and during activity.
How the Test is Performed
This test is done at a medical center. The test is done in two parts:
Part 1: You will walk on a treadmill (or pedal on an exercise mac...
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Nuclear ventriculography
Nuclear ventriculography is a test that uses radioactive materials called tracers to show the heart chambers. The procedure is noninvasive. The instruments do not directly touch the heart.
How the Test is Performed
The test is done while you are resting.
The health care provider will inject a radio...
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Numbness and tingling
Numbness and tingling are abnormal sensations that can occur anywhere in your body, but are often felt in your fingers, hands, feet, arms, or legs.
Causes
There are many possible causes:
Remaining in the same seated or standing position for a long time
Injury to a nerve -- for example, a neck inju...
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Nummular eczema
Nummular eczema is an allergy-related disorder in which itchy, coin-shaped spots or patches appear on the skin.
Causes
The cause of nummular eczema is unknown, but there usually is a personal or family history of:
Allergies
Asthma
Atopic dermatitis
It is relatively uncommon, and most often oc...
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Nurse practitioner (NP)
A nurse practitioner (NP) is a nurse with a graduate degree in advanced practice nursing.
See also: Types of health care providers
Information
The NP is allowed to provide a broad range of health care services, which may include:
Taking the patient's history, performing a physical exam, and order...
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Nursemaid’s elbow
Nursemaid's elbow is a partial dislocation of the elbow, which occurs when the lower part of the arm (forearm) slips out of its normal position at the elbow joint.
The injury is also called radial head dislocation.
Causes
Nursemaid's elbow is a common condition in young children and generally affec...
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Nutrition and athletic performance
There is a connection between food consumption and athletic performance.
Function
There is a large body of evidence showing a relationship between food consumption and athletic performance.
A poor diet will almost certainly have a negative effect on the performance of even the most casual athlete.
...
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Nystagmus
Nystagmus refers to rapid involuntary movements of the eyes that may be:
Side to side (horizontal nystagmus)
Up and down (vertical nystagmus)
Rotary
Depending on the cause, these movements may be in both eyes or in just one eye. The term "dancing eyes" has been used in regional dialect to describ...
