Norgestrel

Provides a summary of interactions with vitamins, herbs, and food

Normal Barium Enema

Courtesy of Intermountain Medical Imaging, Boise, Idaho. All rights reserved. This image shows a normal colon filled with barium. The barium shows up as white on the image. The arrows point to the normal curves of the colon.

Normal function of the mitral valve

The mitral valve is one of four valves in the heart. It regulates blood flow from the upper left chamber (left atrium) into the lower left chamber (left ventricle). The left ventricle is the heart's main pumping chamber. A normal mitral valve has two flaps, or leaflets. When the heart pumps, blood forces the flaps open...

Normal Heart

These pictures show the heart from the front. The right side of the heart is on the left side of the heart pictures. The left side of the heart is on the right side of the pictures. Your heart has four separate chambers that pump blood. The chambers are called the right atrium, right ventricle, left atrium, and left...

Normal Kidney Nuclear Medicine Scan

Image courtesy of Intermountain Medical Imaging, Boise, Idaho. Kidney illustration © Healthwise, Incorporated This kidney nuclear medicine scan shows the normal flow of radioactive tracer from the kidneys, through the ureters, to the bladder.

Normal Menstrual Cycle

The menstrual cycle is the series of changes the body goes through to prepare for a possible pregnancy. About once a month, the lining of the uterus (endometrium) starts to thicken. Then an ovary releases an egg. If the egg is fertilized by sperm and attaches to the lining of the uterus (implants), pregnancy begins. If...

Normal sinus rhythm

The normal sinus rhythm is the rhythm and rate of impulses generated by certain muscle cells as a signal to the upper heart chambers (atria) to contract. The heart contains a cluster of specialized muscle cells that act as the heart's natural pacemaker. This cluster is called the sinoatrial node, or SA node. The SA node...

Normal Vaginal Discharge

A vaginal discharge is common for most women. Discharge may be more noticeable during the middle of the menstrual cycle ( ovulation). Some women even find it necessary to wear a pad or panty liner because of the amount of discharge. Normal vaginal discharge: Does not smell bad. Is not accompanied by pain, itching...

Normal vocal cords

Vocal cords, also called vocal folds, are ligaments that stretch across the larynx and are covered by mucous membranes. The larynx is in the throat just above the trachea (sometimes also called the windpipe). When air passes over closed vocal cords, they vibrate and make sounds.

Noroviruses (Norwalk Viruses)

What are noroviruses? Noroviruses are also called Norwalk-like viruses and caliciviruses. Noroviruses cause gastroenteritis, food infection, food poisoning, and acute nonbacterial gastroenteritis. What causes them? Noroviruses typically spread through contaminated water and foods, although they can also pass from person...

nortriptyline

Nortriptyline is a tricyclic antidepressant that is used to treat symptoms of depression. Nortriptyline may also be used for purposes not listed in this medication guide.

Nortriptyline

Provides a summary of interactions with vitamins, herbs, and food

Nose Injuries

Briefly discusses causes of nose injuries from sports, hobbies, and work-related activities. Covers seriousness of a broken nose and possible complications. Offers interactive tool to help decide when to seek care. Also offers home treatment tips.

Nosebleed Severity

A nosebleed is severe if: You have moderate to large amounts of blood even after you have pinched the nose shut for 10 minutes. Your nose is still bleeding even after 15 full minutes of direct pressure. A nosebleed is moderate if: You have some bleeding, but direct pressure stops it within 15 minutes. The nose bleeds...

Nosebleed, How to Stop

To stop a nosebleed : Gently blow your nose to clear any clots. Sit up straight, and tip your head slightly forward. (Do not tilt your head back. This may cause blood to run down your throat and make you vomit.) Pinch the front, soft part of your nose shut with your thumb and index finger for at least 5 minutes. After 5...

Nosebleeds

Briefly discusses causes of nosebleeds, including injuries, health conditions, medicines, and changes in the environment, such as smoke. Offers interactive tool to help decide when to seek care. Also offers home treatment tips.

Not Ready for Change?

At some point in life, most people think about changing or improving some part of their life. For some people, it might be quitting smoking or drinking less. For others, it's eating better or getting more exercise. Only you know when you're ready. Maybe you're fine with the way your life is going right now. Or maybe the...

Nuchal Translucency Screening Test

The nuchal (say "NEW-kuhl") translucency screening is a test done during pregnancy. It uses ultrasound to measure the thickness of the fluid buildup at the back of the developing baby's neck. If this area is thicker than normal, it can be an early sign of Down syndrome, trisomy 18, or heart problems. The test is done...

Nuclear Medicine Scan

Radioactive tracers are used in imaging tests that help find problems inside the body. These tracers give off particles that can be detected and turned into a picture to help find problems in organs or other structures. The tracer is usually given through an intravenous (I.V.) line placed in a vein. But the tracer also...

Nuclear medicine specialist

Nuclear medicine specialists are medical doctors who use radioactive medicines for diagnosis and treatment of certain problems. Common nuclear medicine tests include bone scans, lung perfusion scans, and HIDA scans for gallbladder function. Nuclear medicine specialists can be board-certified through the Board of Nuclear...

Numbness and tingling

Numbness is the inability to feel anything when your skin is touched. Tingling (paresthesia) is a pins-and-needles sensation, like when your foot "falls asleep."

Nurse practitioner (NP)

Nurse practitioners (NPs) are registered nurses (RNs) who have advanced education and clinical training. They can perform physical exams, diagnose and treat health problems, order lab work and X-rays, prescribe medicines, and provide health information. Nurse practitioners may specialize in the care of children...

Nursemaid's Elbow

What is nursemaid's elbow? Nursemaid's elbow, also called radial head subluxation, means that the radius has pulled away from its normal position. (The radius is one of two long bones in the lower arm, or forearm.) The ligament that supports the radial bone then slips into the elbow joint. When this happens, the radial...

nusinersen (injection)

Nusinersen works by helping the body produce a protein essential to the function of nerves that control muscle movement. This protein is lacking in people with an inherited disorder called spinal muscular atrophy caused by a mutation in a specific gene. Nusinersen is used to treat spinal muscular atrophy in adults...

Nutrients

Nutrients are substances in food that provide energy or are needed to support normal body functions. Nutrients are used to build and repair body tissues, including muscles, bones, and internal organs. Nutrients include: Carbohydrate. Fat. Protein. Vitamins. Minerals. Water.

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