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Drugs and diseases reference index

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Diseases & conditions A-Z List

Diseases & Conditions A-Z List - «N»:

  1. Natural short sleeper Natural short sleeper
    A natural short sleeper is someone who sleeps a lot less in a 24-hour period than is expected for people of the same age, without being abnormally sleepy. Causes Although each person's need for sleep varies, the typical adult needs an average of 7 - 9 hours of sleep each night. Short sleepers sleep...
  2. Nausea and acupressure Nausea and acupressure
    Question: Can nausea be cured by pressing a spot on your arm? Answer: Sometimes mild nausea, even morning sickness, may improve by using your middle and index fingers to press firmly down on the groove between the two large tendons on the inside of your wrist that start at the base of your palm. Spe...
  3. Nausea and vomiting Nausea and vomiting
    Nausea is the sensation of having an urge to vomit. Vomiting is forcing the contents of the stomach up through the esophagus and out of the mouth. Considerations Your body has a few main ways to respond to an ever-changing, wide variety of invaders and irritants. Sneezing ejects the intruders from ...
  4. Near drowning Near drowning
    "Near drowning" means a person almost died from not being able to breathe (suffocating) under water. If a person has been rescued from a near-drowning situation, quick first aid and medical attention are very important. Considerations 6,000 to 8,000 people drown in the United States each year. Mos...
  5. Nearsightedness Nearsightedness
    Nearsightedness is when light entering the eye is focused incorrectly, making distant objects appear blurred. Nearsightedness is a type of refractive error of the eye. If you are nearsighted, you have trouble seeing things that are far away. Causes People are able to see because the front part of t...
  6. Neck lump Neck lump
    A neck lump is any lump, bump, or swelling in the neck. Considerations There are many causes of lumps in the neck. The most frequently seen lumps or swellings are enlarged lymph nodes. These can be caused by bacterial or viral infections, cancer (malignancy), or other rare causes. Enlargement of th...
  7. Neck pain Neck pain
    Pain - neck; Neck stiffness Considerations Neck pain is discomfort in any of the structures in the neck. These include muscles and nerves as well as spinal vertebrae and the cushioning disks in between. Neck pain may also come from areas near the neck such as the shoulder, jaw, head, and upper arms...
  8. Neck x-ray Neck x-ray
    A neck x-ray is an imaging test to look at cervical vertebrae, the seven bones in the neck area. How the Test is Performed This test is performed in a hospital radiology department or in the health care provider’s office by an x-ray technologist. You will lie on the x-ray table. If the x-ray...
  9. Necrosis Necrosis
    Necrosis is death of body tissue. It occurs when there is not enough blood flowing to the tissue, whether from injury, radiation, or chemicals. Necrosis is not reversible. When substantial areas of tissue die due to a lack of blood supply, the condition is called gangrene....
  10. Necrotizing enterocolitis Necrotizing enterocolitis
    Necrotizing enterocolitis is the death of intestinal tissue. It primarily affects premature infants or sick newborns. Causes Necrotizing enterocolitis occurs when the lining of the intestinal wall dies and the tissue falls off. The cause for this disorder is unknown. However, it is thought that a d...
  11. Necrotizing granuloma Necrotizing granuloma
    A granuloma is a small clump of dead cells that form when the immune system tries to fight off a harmful substance but cannot remove it from the body. A necrotizing granuloma refers to an area of inflammation in which tissue has died. Necrotizing means dying or decaying. See: Necrotic Tuberculosis ...
  12. Necrotizing soft tissue infection Necrotizing soft tissue infection
    Necrotizing soft tissue infection is a rare but very severe type of bacterial infection that can destroy the muscles, skin, and underlying tissue. Necrotizing refers to something that causes tissue death. Causes Many different types of bacteria can cause this type of infection. A very severe and us...
  13. Necrotizing vasculitis Necrotizing vasculitis
    Necrotizing vasculitis is a rare condition that involves inflammation of the blood vessel walls. Causes Necrotizing vasculitis is common with: Polyarteritis nodosa Rheumatoid arthritis Scleroderma Systemic lupus erythematosus Wegener's granulomatosis It is very rare in children. The cau...
  14. Neonatal abstinence syndrome Neonatal abstinence syndrome
    Neonatal abstinence syndrome (NAS) is a group of problems that occur in a newborn who was exposed to addictive illegal or prescription drugs while in the mother’s womb. Causes Neonatal abstinence syndrome occurs because a pregnant woman takes addictive illicit or prescription drugs such as: ...
  15. Neonatal conjunctivitis Neonatal conjunctivitis
    Neonatal conjunctivitis is swelling (inflammation) or infection of the tissue lining the eyelids in a newborn. Causes Neonatal conjunctivitis is most commonly caused by: A blocked tear duct Infection by bacteria or viruses, or irritation from antibiotic eyedrops called silver nitrate (these are r...