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Health Topics


Nail Diseases

Your toenails and fingernails protect the tissues of your toes and fingers. They are made up of layers of a hardened protein called keratin, which is also in your hair and skin. The health of your nails can be a clue to your overall health. Healthy nails are usually smooth and consistent in color. Specific […]

Nasal Cancer

Your paranasal sinuses are small hollow spaces around the nose. They are lined with cells that make mucus, which keeps your nose from drying out. The nasal cavity is the passageway just behind your nose. Air passes through it on the way to your throat as you breathe. Cancer of the nasal cavity and paranasal […]

Native American Health

Every racial or ethnic group has specific health concerns. Differences in the health of groups can result from: Genetics Environmental factors Access to care Cultural factors On this page, you’ll find links to health issues that affect Native Americans.

Native Hawaiian and Pacific Islander Health

Every racial or ethnic group has specific health concerns. Differences in the health of groups can result from: Genetics Environmental factors Access to care Cultural factors On this page, you’ll find links to health issues that affect Native Hawaiians and Pacific Islanders.

Nausea and Vomiting

Nausea is an uneasy or unsettled feeling in the stomach together with an urge to vomit. Nausea and vomiting, or throwing up, are not diseases. They can be symptoms of many different conditions. These include morning sickness during pregnancy, infections, migraine headaches, motion sickness, food poisoning, cancer chemotherapy or other medicines. For vomiting in children […]

Neck Injuries and Disorders

Any part of your neck – muscles, bones, joints, tendons, ligaments, or nerves – can cause neck problems. Neck pain is very common. Pain may also come from your shoulder, jaw, head, or upper arms. Muscle strain or tension often causes neck pain. The problem is usually overuse, such as from sitting at a computer […]

Neural Tube Defects

Neural tube defects are birth defects of the brain, spine, or spinal cord. They happen in the first month of pregnancy, often before a woman even knows that she is pregnant. The two most common neural tube defects are spina bifida and anencephaly. In spina bifida, the fetal spinal column doesn’t close completely. There is […]

Neuroblastoma

Neuroblastoma is a cancer that forms in your nerve tissue. It usually begins in the adrenal glands, which sit atop your kidneys. It may also begin in your neck, chest or spinal cord. The cancer often begins in early childhood. Sometimes it begins before a child is born. By the time doctors find the cancer, […]

Neurofibromatosis

Neurofibromatosis is a genetic disorder of the nervous system. It mainly affects how nerve cells form and grow. It causes tumors to grow on nerves. You can get neurofibromatosis from your parents, or it can happen because of a mutation (change) in your genes. Once you have it, you can pass it along to your […]

Neurologic Diseases

The brain, spinal cord, and nerves make up the nervous system. Together they control all the workings of the body. When something goes wrong with a part of your nervous system, you can have trouble moving, speaking, swallowing, breathing, or learning. You can also have problems with your memory, senses, or mood. There are more […]

Neuromuscular Disorders

Neuromuscular disorders affect the nerves that control your voluntary muscles. Voluntary muscles are the ones you can control, like in your arms and legs. Your nerve cells, also called neurons, send the messages that control these muscles. When the neurons become unhealthy or die, communication between your nervous system and muscles breaks down. As a […]

Newborn Screening

Your newborn infant has screening tests before leaving the hospital. There may be different tests depending on the state where you live. They include Tests on a few drops of blood from pricking the baby’s heel. The tests look for inherited disorders. All states test for at least 30 of these conditions. A hearing test […]

Noise

Noise is all around you, from televisions and radios to lawn mowers and washing machines. Normally, you hear these sounds at safe levels that don’t affect hearing. But sounds that are too loud or loud sounds over a long time are harmful. They can damage sensitive structures of the inner ear and cause noise-induced hearing […]

Norovirus Infections

Noroviruses are a group of related viruses. Infection with these viruses causes an illness called gastroenteritis, an inflammation of the stomach and intestines. It can spread from person to person, or through contaminated food or water. You can also get it if you touch a contaminated surface. Norovirus can be serious, especially for young children […]

Nose Injuries and Disorders

Your nose is important to your health. It filters the air you breathe, removing dust, germs, and irritants. It warms and moistens the air to keep your lungs and tubes that lead to them from drying out. Your nose also contains the nerve cells that help your sense of smell. When there is a problem […]

Nuclear Scans

Nuclear scans use radioactive substances to see structures and functions inside your body. They use a special camera that detects radioactivity. Before the test, you receive a small amount of radioactive material. You may get it as an injection. Sometimes you swallow it or inhale it. Then you lie still on a table while the […]

Nursing Homes

A nursing home is a place for people who don’t need to be in a hospital but can’t be cared for at home. Most nursing homes have nursing aides and skilled nurses on hand 24 hours a day. Some nursing homes are set up like a hospital. The staff provides medical care, as well as […]

Nutrition

Food provides the energy and nutrients you need to be healthy. Nutrients include proteins, carbohydrates, fats, vitamins, minerals, and water. Healthy eating is not hard. The key is to Eat a variety of foods, including vegetables, fruits, and whole-grain products Eat lean meats, poultry, fish, beans, and low-fat dairy products Drink lots of water Limit […]

Nutrition for Seniors

Food provides the energy and nutrients you need to be healthy. Nutrients include proteins, carbohydrates, fats, vitamins, minerals and water. Studies show that a good diet in your later years reduces your risk of osteoporosis, high blood pressure, heart diseases and certain cancers. As you age, you might need less energy. But you still need […]

Nutritional Support

Nutritional support is therapy for people who cannot get enough nourishment by eating or drinking. You may need it if you Can’t swallow Have problems with your appetite Are severely malnourished Can’t absorb nutrients through your digestive system You receive nutritional support through a needle or catheter placed in your vein or with a feeding […]